Fuel pump losing prime overnight. The truck is a 98 Western Star with a 12.

Fuel pump losing prime overnight Swapped housing and injection pump, PLV in fuel rail. Thread starter sclord2002; Start date Aug 7, 2009; Forums. This morning I tried pumping the hand primer, but it was hard to push and didn't seem to make any difference. The so called check valves in in the transfer pump arent to hold the fuel up to the motor they are just to supply fuel when running . fruitcakesa Well-known member. Anyways here is the situation. Losing prime in the DD series of engines can be related to a few things, most likely an air leak in the system allowing the fuel to drain back to the tanks causing hard start. This can be caused by fuel transfer pump check valve not seating, letting the fuel drain back,or it can be You have a air leak somewhere between the input of the separator and output of the fuel filter. All you let unit sit overnight and it will lose prime again. 7. I changes the fuel pump and still have the same problem. I called MWFI, where I got the pump,and they sent me a new checkvalve. It takes a fuel pressure tester to test, do not use a tire pressure gauge. The excess fuel from the quantity control valve (Y134) and high pressure fuel pump (7) is routed past the 2-stage valve The only fuel pump as stock is the mechanical pump AFTER the filter. there is NO air leaking, the icv reading is about 65 -70% at idle. The fuel system is losing its prime overnight causing hard starts the next day. I started the engine, it idled fine for a minute, the knocking sound came back and even stronger, and the engine stalled. The easy fix is a lift pump or external fuel pump. The pressure side of the fuel system will hold pressure fine. shim kit, drilled fuel rails, B&w turnover gooseneck, Ma welded waterpump, Profab egr delete, Fass titanium 150, Beans fuel sump, Ma It fight in tight and the dealer assembled the picj up tube and keepers so that was all ready to go. It still does it!!!! I can choke it and work the pedal and then eventually it will start to pump fuel after a few minutes. I havent needed it yet. Jul 25, 2020 Ive replaced the fuel line coming from the fuel filter to the injector pump thinking it was leaking there, but that was not the case. The pump will not prime itself. 12 valve losing prime??? It is common for the fuel lines to go bad in these trucks. It's looking like a faulty injector to me but I've been told the diagnostics have been run and all are within spec. What keeps the pump from pumping when it is full of fuel, is air present at the inlet. We did a write up in Diesel World about this problem a few months ago. My plan was to replace the filter top/primer pump in case it is bad, then the injectors in case they are leaking down? Is there anything common or obvious that I should If you're sure that you're losing prime then air is getting in somewhere and allowing the fuel to go back to the tank. Turned it off to do a once over for leaks etc and it sat for maybe 30 + minutes. Mostly stock, with an Edge comp Box, and the replacement FASS lift pump, the injection pump was rebuilt @50,000 miles ago. this has If I just shut it down for a couple hours during the day, it is fine. ,, but after i got the truck into the shop and above freezing it would not lose prime!~ hope this helps! Diggy:ro) The check valve should be between tank & filter if it is present. The fuel pump has a check valve built into it that is supposed to keep pressure to the injection system when you shut down and vehicle sits. I find it hard to believe that an internal leaking fuel tank pick up would cause a sporadic loss of prime. I thought it was my fass filters on my lift pump so I changed them, was fine for a few days but then It started losing Losing Prime Overnight. It will always eventually start. Transfer pump has been replaced as well as all fuel lines, tank flushed for debris, filter housing thoroughly checked, filters replaced. 5 - 1997 7. 0 Diesel I recently bought (last week when I traded in my S-10). Overnight the pump will drain into the tank. Still sounded like it was starving. At that age, all fuel hoses should be replaced. WoodyF10 New User. If you have good power under load, I would just install an electric fuel pump for priming before starting truck, similar to a Cummins NT-855 PG270. Losing fuel prime. transfer pump and check valve at the back of the head have been replaced. As soon as I turn the key off, the fuel drains out of the So i have an 01 lb7 with everything stock past few mornings i have had to prime the truck. Everything in the fuel system is either new, or has been thoroughly cleaned. The lift pump was changed a couple months ago because it was weak so I was pretty sure it wasn't the problem. Battery voltage is up at 12. Yesterday, I installed a new fuel filter, added a water sensor delete plug, and replaced the bleeder valve with an aftermarket one and the truck still did the same. The other pump are mounted on top of the tank. takes 10 cranks every time i park it for 10+ hours . Put fuel in the tanks, it didn’t have this issue before the cam housing. The pump will not pump air. rdalrt Active member. i would pull the pressure line off of the fuel pump and put a long one on it and dump it into a bucket. All I had to do was push the elbow in place secure the parts that makes it expand so it cant come loose and connect the hose going to the prime bulb. Note: if Dodge 24 valve, refer to “Hard Starts” Check all connections and fuel line for obvious sir/pressure leaks (a leaky unit can cause a break in the vacuum, allowing the fuel to drain back into the fuel tank) Yes, a boost pump or lift pump is going to eliminate the loss of prime and the other problems that are caused by fuel system leaks to the point the truck will run and start. Mine just went through the same symptoms and finally quit starting all together unless I used ether. Leaks on the pump’s intake line as well as around the shaft seal of the pump housing itself can cause your pump to lose its prime. Home of Mazda3, CX-3, CX-30, 323, and Protege. I have the pump on a timer, and it is losing prime at night. L. It ran for a month and did it again and he was able to prime it again to get it atarted. DPE73120 Injector Installation Kit for 1990 - 1994 Ford 7. 3L Power Stroke Diesel - Fuel Leak, Losing Prime Overnight - Over the past few weeks I've noticed a small fuel leak under my truck. Will prime the system quick. The fuel filter is replaced every 7k to 8k miles (every oil change). Played the game for over a year with filter "o" rings injector pump and various "ideas" none of which worked for very long. One is on a 12,000 gal tank with dyed in it and pump is flooded. I'm not familiar with how the fuel pump on that tractor, so it may be an issue in the pump. If it's still losing prime I will probably then tear the IP out for service. It sounds to me like you are getting combustion gasses in your fuel. I recenlty had the head gaskets and injectors replaced. Doesn’t matter if the truck is switched off for 5 seconds or 5 days same issue. Did it at 12 degrees out on a cold start, then 3 days later at 60 degrees after sitting two hours and today at 50 degrees after sitting an hour. Had some bad three By chatting and providing CAT 3208 90N72783 had trouble losing prime, replaced hand priming pump, fuel lines and installed check valves. 1999 International DT466E losing prime overnight. I'd crank it up and take off and it would run for a few seconds, then die. It has front and rear fuel tanks and both have plenty of fuel, and it loses prime under either one. we replaced pump, installed new injectors and lines. After the install, we finally got the engine to start after fuel priming and was idling in the shop fine. We do observe any leaks. I'm deleting this mess and bought a filter base to run inline with new lift pump, I found 180* metal fuel line to loop line I am trying to help diagnose a 9860 which is losing fuel prime overnight, also running rough. no signs of external fuel leaks. 28 12 Lately, the engine keeps stalling out due to fuel loss (despite the tank still being halfway full), and it's happening somewhere between the primary fuel filter and the 6. Did it at 12 degrees out on a cold start, then 3 days later at 60 degrees after I have an 05 with similar overnight prime loss. When there is an air leak, air leaks into the fuel system before the Injector Pump and almost always before the Lift Pump. I am presuming it is losing prime, but am unsure. Some days you turn it off an it won’t crank back up. My 2014 frightliner Dd15 keeps losing prime new pump back in Oct 2020? Freighter 2014 cascade dd15. Then goes fine for rest of day . This is commonly caused by a blockage in the fuel line or an air bubble. It's strange, I had no issues when I first installed the FASS, but when I started jacking around with the lines trying to isolate the pump noise I began getting prime loss problems. When pump first comes on, a little air comes out, but after, runs fine. Register or Log In To remove these advertisements. Somehow if the truck sits 10 hours or more, the fuel system drains back to the tank and I have to pull a slug of air through the entire system each 2011 Ram 2500 5. 1991 F350 7. The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic An oil furnace that loses prime simply means that fuel oil is not getting to the burner nozzle. Replaced the intank lift pump. I recently replaced my rubber fuel line from the pump to carb with a steel line with as minimal rubber as possible. I tested the fuel pressure after it sat 10 hours, the gauge slowly moved from 0 to 30 psi, thats when the moter finaly started, and then the pressure continued to rise to 50 psi where it stayed stable. A description of the fuel system is as follows. Check valve holds fuel in the head. So far I changed - 1-Check valve on fuel module (outer side of big fuel filter casing, alenkey fitting ). 74, Gear Vendors Overdrive, LSD,s front and rear, Dynatrac hubs, 5" aluminum driveshaft, Steering brace, AFE SS exhaust I got 2015 Cascadia with DD15 in it , it got 1. The problem is that it is loosing prime when sitting overnight and is hard to start. koeo, inline pump runs and fuel present through all engine fuel lines and out the return at the back of the head. Thanks again, I will keep posted on what I find. so lets rule those out. If there’s not then that’s your problem, if there is one there then remove the lower ring and make sure the o-ring on the plastic bowl isn’t pinched and is seated properly at the bottom and not in between the ring and bowl. - this only happens when the car sits for quite awhile. Jim: CATGUY: Posted 6/24/2011 22:18 (#1834164 - in reply to #1834121) Subject: RE: 3208 loses prime: Iowa: the more likely the fuel pump wants to "suck air" around areas like: the governor's throttle shaft seal and the seals around the fuel transfer pump. 15,928 I have an inline fuel filter in a steel line between the Carter stock mechanical fuel pump and carb. Any ideas why? (overnight) and cause you similar problems starting. If I watch the pump when it's been turned off, the basket will hold water for hours and restart normally but won't last 12 hours. For it to be losing prime. One of your local auto parts stores may loan you one It sounds like the pump may be going out. Many times the T is to allow lift pump fuel to vent. The truck always fires up fine but starts to miss and die after 30 seconds or so. Steps To take If Your Pump Is Losing Its Prime. Posted 3/24/2016 14:31 (#5197047 - in reply to #5194119) Subject: RE: fill rite pump losing prime: Royal City, WA: We have 4 fill rite pumps on gas and diesel tanks. Thanks very much for all the help folks , this site is fantastic! 2005 My 440 six pack loses fuel prime overnight. Its obvious that there is air in the fuel line b/w the filter and IP. SteveR. l_c Veteran Member. The high pressure fuel pump (7) pressurizes the fuel up to 900 bar (13,053 psi) and is then fed to the fuel rail (8). In many cases, there will likely be a partial ignition and then the furnace will automatically shut down. when i was haveing the loss of prime occur every day, it was very cold here -25+ C. I have spent months working on it first tried changing fuel filter housing no luck so mechanic shop installed a lift pump and it still was getting air in it. it would start and run for a few minuts and then die out. It was running smoothly UNTIL I hooked it to a large RV. Even if fuel drifts out of the fuel lines during sitting, the amount that surges through when the pump primes will fill everything up in a few seconds. I put a fuel pump on my 52 willys and it turned out to be a problem with a hose going from the tank to the metal line on the frame. The fuel filter has to be seated properly, otherwise it wil return to the tank and lose prime. 445 Satisfied Customers. maxwell99. if all else fails try a fuel pump check valve, napa used to sell em but discontinued them for some stupid reason. Mechanic at my own shop When diesel engine looses prime overnight, the fuel is draining back to the tank. 3m miles on it . I will leave the truck overnight and see if it loses prime overnight. The pump does not take 75 or 100 pumps to prime solid, just a 1/2 dozen will make it to hard to continue to pump. Rawze Forum Reject (14187 Likes) Posts: 11,410 Joined: Jun 2013 : RE: Losing I've got a 2015 D13 and I'm losing fuel prime completely randomly. If i park on a slope with the nose down, it usually will start without pumping the primer on the fuel head. volvodriver01, Lonesome and OwnerOp Thank this. By manually pumping fuel you are basically doing the work of the low pressure pump. I am losing prime overnight and have extended initial crank times now. My 9300 seems to be losing prime faster, like if it sits overnight with the tank quarter full it will start hard, if tank is full not much of a problem, there's a obvious checkvalve on filter housing, where else might I look? (#10276870 - in reply to #10276855) Subject: RE: Jd 9300 loosing fuel prime? NW Wyoming: If you still have original The most common cause of the fuel system not holding pressure up to the injectors is the fuel pump inside the fuel tank. Its actually for a different model duramax, but it works for 2 days, then starts doing same as previous housing, Losing prime overnight. Once it starts it has no issues, like I'm loosing my prime when it sits. I lube the o-rings really well, push the fuel filter down until it seats, you will feel it, then screw the cap on with lube on the cab. You may not have a leak, just a restriction and your filter isn't staying full and when you park overnight, the fuel in the line to What would cause my cat 938g to lose fuel prime at night By chatting and providing personal info When diesel engine looses prime overnight, the fuel is draining back to the tank. I suppose fuel lines could be the problem. Went to start it again and it wouldn't, had to prime the fuel system again. Do not fill the filter, it will introduce contaminates that can damage the injectors, pump, and other sensitive pieces. SHC, Nov 27, 2011. It started out the truck would lose prime overnight now it is only taking an hour for it to happen. I cleaned it and all was good. I'm pretty sure it's losing prime because if you cycle the fuel pump with the key 3 complete cycles it will fire right up. The fuel pump may not be able to keep up with engine demand, and can't maintain the ~60 psi (it's ok to drop a little while the engine is speeding up, but should quickly return to My 2007. You're probably losing fuel at the carbs from evaporation or leakage due to deteriation of a rubber part like an o-ring etc. Jump to Latest The fuel pump is getting fuel to the secondary filter bowl and it will overflow all over the place if I leave the key on with the cap off. 5 and drops at the starter to 7. I have to spray the truck off and with just a dab of fluid it fires right up and will run non stop till it’s switched off. 2019 cascadia with dd15 losing fuel prime overnight. A. You most cost effective route for the long run would be to convert to e-fuel. Check for leaks- 90% of all pump problems occur on the suction (or Intake) side of the pump. AZ_Chip. R. If I were to leave the valves on pool function, eventually pump would prime, so whatever it is, isn't enough to keep pump from priming, but enough to break vacuum overnight! I am at a loss! Customer: M9540 losing fuel prime when parked overnight. Nov 4, 2020 #1. Fuel lines from filter to pump. TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille (06-24-2024 ) walterk Wrote: Not sure if 2250 is the same as 2350, but 2350 should easily build 30000 psi during the test, at least mine does. Once it To rule out the possibility of a leak in the fuel line(s) or connections, I ran a direct 3/8 inch fuel line from the tank to the pump and another one from the pump to the fuel bowl. i suggest you Fuel Pump losing prime The 1967 - 1972 Chevrolet & GMC Pickups Message Board. but after sitting overnight no start Was Feb in Alberta COLD, found the water bleader on bottem of filter had a bad seal deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam 2001 2500HD Sierra w/6. You will have about $3-400 in a diy setup, but the benifits far outway the initial cost. FASS unit and the injection pump (or fuel pump). Runs fine doesn’t miss a beat, Pulls weight fine no issues. Any ideas on where to look or check first? ,if all that checked out with flying colors replace fuel pump! Been down You put a lift pump on it, if you were loosing prime on the engine side of the pump it would be a leak where the problem is. customer also installed an inline pick up pump on the chassis side. This has never occurred before nowI have to take the gas hose lose at the pump and add gas in the hose to fill the carb bowlthen it starts right away. I probably should just do the whole thing, IP, new everything and be done with it, but that's expensive for me right now. Borrowed the MV (Mityvac) again and verified the filter holds vacuum with no lines attached and filter empty, ok. If it's sat for more than three days or so, I typically "bump" the starter and let the lift pump cycle to reduce crank times. I have a set of new replacement injectors in my parts stash, and have ordered a new fuel filter top/pump. I would replace those three line sections, (separator to lift pump and lift pump to fuel filter and fuel filter to injection pump). I replaced the fuel filter head and filters, one check ball was sticking. What possibly could be wrong. If I unscrew the cap and turn the key, the housing fills right up, then I can put the cap back on and the truck starts up after a few cranks. hg. (anywhere from 30 to 60 pumps with the primer, I can here a gurgle in the fuel tank when doing this) Then it will start immediately, but will stumble and smoke a little until air is cleared from the system. My 1996 Lawn tractor with Kohler Command engine loses prime in the carburetor after sitting for one week. High pressure lines and seal from pump, blocked off return and left over night still have the same starting issue. The fuel tube out of the tank goes under the I bought a new fuel pump and put it on. Checked codes and got the P0087 and 2291 codes. A good working fuel pump will draw and hold 14" in. If you manage to pull out anything further than the spring and non return valve, you can mess up your fuel delivery that will make one get more fuel than the others. This is a job that’s best left to a professional mechanic, as it requires specialized tools and knowledge. Customer: Isl9 Cummins fuel pump will not hold it’s prime when switched off. 1981 F350 97 12v, 47re with E-TransControl, Dodge Dana 60 with free spin hubs, Dana 70, B&M Mega shifter, DAP 5x12 VCO's, Water Methanol Hey guys, got a 95 3500 with the cummins i replace everything from the tank lines to lift pump to fuel heater. Paul New lines, hoses etc. If the pressure drops then the pump has to prime the system to bring the pressure You need a minimum of 60 psi to start. Replaced the "pressure regulator" on the return side on top of the head, still did it. I hope not. Many just replace all lines with good marine diesel rubber ones and be done with it. Fuel filter losing prime. You are likely to be sucking air on ur fuel line. Rebuilt carb, new fuel filter, fuel pump, fuel tank sending unit and pick up tube. Then let it sit overnight and the pump loses prime and I did a CP4 to CP3 HPFP conversion and after a couple of months it lost prime at the fuel filter. Could it be the primer unit, injector seals, re I’ve got a 2006 C15 Acert that is getting air in the system on the suction side before the fuel pump. First start in the morning i have to hold key long enough to prime the fuel sytem. Sometimes, not often, once a month or so my truck at start up won't fire, just turns over. If I keep it cranking for around 15 seconds then it fires right up like nothing was ever wrong. Nothing worked. Easiest way to pressurize the tank is by blowing air into it, using a rag wrapped around the blow gun. I have been told that it might be my fuel pump which has a one-way flow valve that has become stuck allowing fuel to flow back to the tank. Carbs don't usually "back siphon" thru the fuel line as the float drops because the inlet is usually My truck is a 1999 2500 Quad cab short box, 230,000 miles. It is a check ball style fitting and the pump was calibrated with it. after installed lift pump with a check valve, the hand pump is very firm even after overnight. StevenR1010. You need to remove the secondary fuel filter and fill the housing with clean fuel and then unplug the fuel pump. Fuel line damage is a common cause of fuel pump issues (This could account for 90% of cases). However, you can prevent and address this issue by inspecting the suction lines and connections, checking for air leaks, Try hand primer pump they normally fail and cause loss of prime. I don't think I'm losing water underground - seems my pool level is OK. Turning over engine for about a minute (or more) and system starts to kick in and after about another 15 seconds starts running fine. When running it runs great and maintains speed to hit 60 Hz for as long as we need That fuel system on the truck is all under pressure from the fuel pump up to the motor. PRIMING and STARTING. 9. Loss of prime can happen in one of a few ways. Trucks whipping my butt. but others may be dealing with this, and I need help. but good, that is not your problem. 77@ 124mph at 7700# fuel only-e. I have replaced all fuel lines to and from the pump to troubleshoot, no change. Regular Maintenance: Maintain water levels, clean filters and skimmer baskets, and inspect for leaks regularly to ensure optimal pump performance and prevent prime loss. If you have good pressure you are not loosing prime. On start the fuel pressure increases to 58-60 psi but within seconds, gauge drops quickly to 0 psi- even though key is still on. Thanks Given: 4 Thanks Received: 22 (7 Posts) Posts: 20 Threads: 2 Joined: Apr 2022 1 05-13-2022, 09:21 PM . Aug 7, 2009 #3 sclord2002 said: My B7200 loses fuel prime overnightBleed system to start it and it runs great and restarts fine but next day it has to be blead again Oem fuel pump or aftermarket ? 1994 12 valve soot machine they self prime as soon as the engine starts cranking. I’ve replaced. I reprimed the fuel filter----nothing. ie, overnight, Car starts then instanly dies!!! Its like it loses its fuel prime. I replaced the seals in the filter head and it worked great for 3 days , so i thought that was the problem, but then it was back to the same old thing. I have an aftermarket H&S lift pump and I can hear the pump coming on but it takes anywhere from 2 to 10 key cycles to hear fluid start flowing through it and have pressure show up on my regulated return. stayinback Road Train Member. I removed the basket from the pump and cleaned, checked, and lubed the o-ring at the Replace the fuel filter to help the fuel pump, but it sounds like the fuel pump check valve has gone bad and your losing your fuel pressure to start the engine. Detroit mentions a I have checked, and checked, and double checked for leaks and I can't seem to find any. The main reason behind the fuel pump won’t prime may be a faulty fuel pump, the relay itself, or the internal suction mechanism that creates the air void. Only fuel. Last few times we've run it seems like fuel system is losing prime after it sits overnight. It started when the truck sat overnight, now the issue starts earlier, even as much as 4 hours. (ALWAYS remember this side of the fuel system in under a vaccum) - From the transfer pump to the secondary filter then finally fuel is fed to the injection pump thru the special hose 688190C1 to the Model 100 (ALWAYS remember after the fuel leaves the transfer pump it is under pressure) if fuel is bleeding down suspect a leak on the vaccum side The fuel around the injector pump, there are O rings around the delivery nozzles. Ensure that the pipe connections threaded into the housing are tight and If you have or can borrow a vacuume/pressure gauge you can test the fuel pump. DetroitS60 Bobtail Member. 3L Power Stroke Diesel - Loss of fuel in system after sitting - Okay, I figured out that my truck looses the prime on the fuel system if it sits overnight. If the truck is off for longer, I need to cycle the fuel pump a few times 8. after turning then moter off, the presure lowered to 30 psi where it stopped or appered to any way. Equipment M 6040 Oct 26, 2010 856 270 63 The manual prime Why Is the Fuel Pump Losing Prime? 1. I am thinking the fuel pump is losing prime. The owner was able to get the engine running again with manually priming the fuel filter. The problem with the truck in the article was the fuel Hey, Mike here with a 2013 lml duramax losing prime. Use the primer pump to prime the fuel filter. Could fuel draining back from the filter to the tank cause Fuel is meant to drain back to the tank its the way it is designed to work the fuel gets siphoned back thru the return line when the truck isnt running hence the fact it looses prime . don't wait overnight to check, come back after 5 minutes, then 10, then 20, then 30, and The truck is a 98 Western Star with a 12. I have a 2000 peterbilt with a c-15 6nz motor and sometimes it will lose its prime overnight sometimes not. Losing prime Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by stayinback, Jan 1, 2020. . r/mazda3. If I let my truck set around 6 hrs or overnight, when I crank it, it runs around 20 seconds then shuts off and I have to re-prime it. pop the hood, prime the filter, go back, cycle key, waity to start, cranks longer, then fires and runs fine till she sits. Got it all back together but, now the low Then it will take another 20-30 cranks to fire right off and run great. Still did it. the new ones with the pump in the tank leak bad enough you know where the problem is. 73 LSD, IssproEV2's, Performance 48RE Opie TransGo , Smarty Tuned BBI Customer: CAT 3208 90N72783 had trouble losing prime, replaced hand priming pump, fuel lines and installed check valves. im sure theyre available from other vendors. LML Losing Prime ? Question: Jump to Latest DF165 w/ tank sock,delete,TD-Max boost controller,OPS extension hose,Glow Plug Harness,Glowshift Maxtow gauges,Boost & Fuel Pressure Bolts,2/0 Battery Cable Upgrade,PMD Re-Location Kit, in Losing prime at injector pump. Just wondering if there's any other areas I might need to check before I start worrying about looking @ the fuel pump or injectors. 2-Loss of prime on turn of key. When it’s bad, it drains into the return. 93 F-350 The car runs just fine, but has a lot of bubbles in the fuel line and the IP is losing its prime, making the car very difficult to start. 3,911 8,255. I wouldnt nother with pickup the hand pump should stay 'very firm' even hours after the engine is powered off. Fuel pump losing prime overnight? The longer my 1996 Dodge Ram 2500 Diesel sits, the longer I have to crank the - Dodge 1996 Ram 3500 Club Cab question. Car Specialist. 50 to 75 psi should be about right remember to put a inline filter before I'll start the truck up, it will run for 15-30 seconds and then stall. And run fine after the pump gets primed. 3 idi : It has a new lift pump, new return line kit, new Motorcraft Glow Plugs, and all injectors have been externally cleaned, and all seem to work. When this occurs, the fuel pump cannot send fuel to the nozzle. No change, all check valves work, swapped two stage valve in pump, it’s a Gen 1 two filter housing. 2-Check valve on end of fuel pressure line . just put motor in and the fuel pump is losing prime from the tank if it sits very long. the truck starts for about 5 sec, then dies. Note; when replacing the injection pump, leave the return connector in the rebuilt pump. , ultrashift He should start a poll and have us all check our fuel pumps. Replaced the pump and all is well now. 15,928 Satisfied Customers. Icp and ipr numbers are good, no codes or performance problems and no signs of aerated fuel. Nothing. NV5600, 3. I'm out of ideas. I know the problem is that the secondary fuel filter housing is losing it's fuel prime. Starts up with minimal delay (Maximum of 2 sec crank time) unless it has been sitting overnight. Someone had told me about check valves around the pump, but I'm not sure of what I'm One thing of note if anyone else is troubleshooting this problem, the filter head seals seemed to act differently in the cold weather. You can try crimping the fuel return line to pressure the lines. 2003 CBR 600rr new fuel pump sus comments. A few months ago I tested itand it got up to 30k But then it would drop like a stone so I changed the relief valve and it was better. The owner was able to prime the housing manually and the truck ran good for a month and starved again. 5 LMM kept losing fuel prime for 2 years, but only when it was above 90 degrees (Texas) and after I'd driven it, then killed it and let it sit for at least 10 minutes (like running into a store). try turning the key on and off a couple of times to prime the fuel pump after that see if it cranks (dont use starter fluid) Read full answer. Could be the black bleeder screw, the WIF sensor, the filter head itself, the gaskets (top or bottom), or a leak in the line back to the tank. yellowman99. You can do this but an electric pump will be required. The larger the leak the more cranking it takes to re-prime. you could try buying an electric inline tranfer pump and installing it between the filter and the tank. would not start until i primed the fuel filter Pump loss of prime can be frustrating and result in significant downtime, lost productivity, and increased costs. There is alot of good advice here, but you also need to consider the o-rings on the fuel injectors. Disconnect the coil wire (to make sure it doesn't fire) and have someone turn the engine over to see if the pump is pushing out fuel. Jan 24, 2014 So in the secondary housing, you changed the check valve/regulator already, and you already put a new fuel pump. Joined Nov 2, 2008 Optimax have at least 2 electric fuel pumps, low pressure and high pressure. My 2003 GMC duramax loses prime sitting overnight and sometimes in a few hrs. I have two lines in the bucket, the suction and return. Because you were There is a check valve in the fuel filter housing. Good clamps used and tight. 0L Power Stroke Diesel - Loss of Prime???? - I have a 2004 F350 6. I cant get the machine to start so I pump the bulb it cranks up and runs fine. It might start squirting fuel under the hood and making an unholy mess. Kinks in the stock lines can create cavitation (like my jeep seems to be losing fuel pressure over night. I go to Chevy dealer and replace with acdelco this time. Only have about 1 inch rubber line at connection points at carb, fuel filter, and pump. 3L IDI Non Turbo Diesel Trucks Customer: I have been losing prime from the fuel pump. Has a Cummins PT fuel system, and an aftermarket filter/water separator from NAPA. Such a static air leak can lead to the entire fuel system to drain-back into the fuel tank (siphon) to the same level of tank contents. 1994. Because the injection pump was above the fuel tank, it was under vacuum when the engine was shut down. ( Running on B100 ) started losing prime overnight Detroit Series 60 repeatedly losing prime Discussion in 'Trucks [ Eighteen Wheelers ]' started by DetroitS60, Nov 4, 2020. I replaced the fuel pump, since the stealer said that was the problem. Parking nose down elevates the fuel tank so that the fuel has a harder time flowing back to the tank. replaced fuel filter base; tried multiple new primer pumps; new cat fuel filters; new fuel lines from tank to engine; replaced the fuel check valve; as a last ditch effort we put a check valve in at the top of the suction tube on the fuel tank to prevent any fuel from running back into the tank. GM trucks are bad for rusting out metal lines and losing prime also. Mine will also start better when parked on a slight incline. Answered by Daniel Wilson in 1 hour 3 years ago. I have an 03 f450 that's losing its fuel prime after sitting for over 6-8 hrs once started it runs and starts great all day. Any recent changes to the truck since this started? I assume no new filter 3 weeks ago? Fuel pump losing prime The 1973 - 1991 Blazers, Jimmys, and Suburbans Message Board Register or Log In To remove these when I bought it but you could fill the carb bowls with gas a couple times and it would prime up and run but would lose prime if allowed to sit overnight. Thats where the extra cranking comes from. This valve not only regulates fuel pressure to the Injector Pump, but in theory should hold fuel in the Injector Pump when the engine is off. So, if you have a high pressure rail system, that would be a good start. Joined Mar 4 I'd think your sucking in air and not loosing prime, after it has sat for a while crack open the bleeder and manually pump the LP. Quote 2006 Volvo VNL 780, " Arvey" Volvo D12, 465hp, 1650 ft/lbs tq. All that said, you have a leak in the fuel system. But if it sits overnight it gets hard to get it started. have two 1987 3208 cats 375hpengine stopped If it's still losing prime I will replace the lines and the fuel pump. Uhnope! Still have the issue. Works fine for 3 days. Remember, as fuel is drawn it creates a vacuum & u will most likely not see the problem area. I cracked 2 injectors & finally got it started. If it has been sitting for 12 plus hours it keeps losing prime. Increased fuel pressure, more consistent fuel pressure, smoother idle, better throttle response. Whatever it is, it ends up creating erratic behaviour on the car where you’ll see a performance drop or failed crank every time altogether. the same thing happening to my 2005 5500 the last few times i tried starting it when it was outside below 20degrees overnight. I have to go under the hood and pump up my diesel fuel system - located on the passenger side of the engine. CAT 3208 90N72783 had trouble losing prime, replaced hand priming pump, fuel lines and installed check valves. The tractor will start all day but I've got a 2015 D13 and I'm losing fuel prime completely randomly. Seems like it has little loss of prime whenever I have a full or nearly full tank of fuel. I have a 12 hour on / off cycle. Your pump may lose prime if there are leaks in the Losing fuel prime when set overnight. If you drive Troubleshooting Steps: To fix a pump losing prime, check for leaks in the pump housing and piping, inspect filters and baskets for clogs, and ensure all connections are secure. 2006 int 4300 dt466. There is no such thing as loosing prime to the injection lines. Poppit valves inside fuel filters aren't 'air tight' so if this retro-drainage is happening, you probably have a pinched or incorrectly inserted a gasket on one of your fuel filters. i have used double clamps on both side of the hand pump to ensure there is no leaking. Replace the Fuel Pump: If the fuel pump is faulty, you’ll need to replace it. Fuel pump died just over a year ago, replaced pump runs great for 1 week then I get hard starts check fuel pressure and it drops to zero in about 30 seconds so I replace pump works fine for about a year then get a hard start a few times till now its all the time, I check pressure and it drops to zero in about 30 seconds after key is turned off. So my 1st issue would be to find out why your losing your fuel prime. Loosing prime overnight . Your going to have to keep priming the fuel system by turning the ignition key to the run position for 5 seconds 3 times before you try to start the engine. Any ideas!! We tried priming it with the lift pump many times and it wouldn't start. Will bad fuel rubber lines going further back cause this loss of prime as well? Any thoughts would be appreciated, I am sure it is the low side air leak somewhere. 06-27-2024, (Subject: Losing prime overnight/fuel pressure problem ) Post: #9. Fuel lines with leaks and cracks. A quick bleed and a couple dozen pumps and it will start right up and run fine. Retest. I'd been reading about how the only way to effectively chase a fuel leak is I have a d13 that looses fuel prime overnight, thinking may be a check valve? 2014 volvo sn:en153361 engine d13h425 By chatting and providing CAT 3208 90N72783 had trouble losing prime, replaced hand priming pump, fuel lines Kennedy Diesel-owner More than just a salesman-I use and test the products that I sell on a daily basis! Superflow Lie Detector in house 2002 Chev K2500HD D/A CC Long LT 11. After it gets primed and starts up it runs fine. so if its "making its own oil" thats a pretty good indicator. I always lose my fuel prime if I let the truck sit for more than a few hours. Cat Man. 04. I have a nicktane adapter with a new DD13/DD15 Fuel Priming Issues. Doesn’t spit, sputter or anything after it’s running. Jan 1, 2020 #1. I think there’s also a check valve built into the fuel pump also. DOM 10/73. Pulled fuel pump off and had rebuilt, they repaired camshaft and replaced all seals. This is very common, especially after a fuel filter change. go out to it, turn the key on, everything cycles, then cranks. put this out there. 8 while cranking. We have replaced the check valve on the fuel pump and tried replacing the filter head where the return line connects. But running perfect. Does this sound right and what could be causing it? I replaced the diaphragm in the fuel pump and am probably going to pull the fuel pump. I need to solve this as I don't want the pump starving repeatedly. F. Since you have the Nicktane setup, do you still have an old stock filter you could install? 1999 - 2003 7. Eric106 Location Offline Junior Member Reputation: 3. 6L Duramax diesel. i do not notice any fuel smell or a leak anywhere. I replaced return lines, caps, and fuel filter. Whether it sat overnight or for an extended amount of time, didn't make a difference in how Replace Leaking Fuel Injectors: If you suspect that leaking fuel injectors are causing the drop in fuel pressure, you’ll need to replace them. Your pump may lose prime if there are leaks in the LB7 losing prime overnight. Air leaked in, the injection pump could not pump air, and it was necessary to bleed A leaking gas cap may not cause an immediate loss of prime, but it certainly could allow a slow bleed down overnight. Most likely a faulty check-valve going back into the tank on either your return line or your primary line. </p> N14 losing fuel prime Jump to page : 1 Now viewing page 1 [50 messages per page NE Iowa: Have a 1999 N14 in a 9400 Binder and it loses its prime overnight and needs a snort of ether to get it to turn over every morning. Car Specialist There is so many places you could have a air leak, Fuel head,lift pump,Duel tank switch(O rings),At the fuel tank (O rings),Return line O rings,Dry rot fuel lines etcId say just start at the oldest part and work from there, I got mine from the Diesel store. Help I have a 2012 with a mp7 2010 emissions (spark assist) the problem I'm having is it looses its fuel prime over the weekend, sometimes overnight. It runs fine. Truck ran great and developed an issue with the fuel filter losing prime. If we let it sit for too long it slowly loses prime and will not start without priming the fuel system again. I am assuming I need to check the return line that goes from My JD 5420 has started to lose fuel prime when it sits overnight. . If it was running fine down the lake and then shut off, don't see how it is "losing prime". While I had it off I didn't know what else to look at. I have to manually prime the fuel, sometimes I have to repeat the procedure twice. 7 liter series 60 Detroit engine (500hp). SHC, Nov 27, 2011 #10. That didn't fix the problem. Is your davco bowl empty or can you see fuel? If it’s empty then remove the top cap and make sure there’s an o-ring there. It does not lose prime this way. t. When the lines from the draw straw are connected to the pump I lose prime. If the governor came apart inside the pump, then the return connector could be restricted and cause running issues. I assumed this was due to the junk Edelbrock carb that was on it and Fleshing out the story in the last paragraph of post #9 I had a small fuel leak at the discharge valve on one of the three cylinders of my injection pump (the delivery valve). () It appears as though the fuel pump is loosing prime when it sits for long periods of time. I am ASE Master Certified. Do you hear the pump run when the key is turned on? Pump should run a few seconds and shut off. Last 8 of VIN: XH680693, Already gave you that info, 80K, Primed the After priming the fuel system with a pump the truck will start up just fine. I have a MBE 4000 in a century that is losing prime on the fuel system within 10 minutes of shutting it off. Thanks, Noah Sounds like classic loss of prime issues to me. If you have fuel to the CP-3 it will not be loosing prime, if you don't have fuel there you have a bad LP or a problem in the tank. Search "losing prime" and other similar words. Again, this What seems to work the best (before trying to start engine) is to open the hood and use the hand fuel primer until I get pressure. 5 Regular Cab SLT Sport, Long Bed. Then have a friend crank the truck while you watch for bubbles in the fuel bowl. Usually only when the vent screw is opened up at filter service. The small amount of air that will be present in the top of the filter head will be purged by your electric fuel pump when your glow plugs are warming. DD15 loosing fuel prime Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Mechanic jeff, Feb 22, 2024. of vacuume on the suction side while cranking the engine and produce and hold 4-6 psi on the pressure side, and like the others said an air leak between the fuel pump and the fuel tank can also make an engine hard well i'm pretty sure the 22r's don't have a pump in the tank. sometimes it. Drew I am apparently losing prime when sitting. 3208 cat no start / stall no fuel to injectors? Have kill solonoid removed! Can't find hand prime pump? Not on fuel. Takes 30 to 40 seconds grinding the starter to pick the fuel back up. needs help 2005 Chev K3500SRW D/A CC Long LT(SOLD) 2007 Chev K2500 Classic EC Short LT (Sold) 2012 GMC K3500SRW D/A CC Long there should be some type of transfer pump between the injection pump and the tank, an inline transfer pump most likely but it can also be inside the injection pump. It’s fine during the day but loses prime overnight. Expert. Thread starter WoodyF10; Start date Jul 25, 2020; W. A few months ago the truck began starting hard, When you try to start the engine, the fuel system must re-prime before the engine will start. If you have no leak when the pump is running I'd look on the tank side of the pump. If air bubbles come out your sucking in air. I have made extensive repairs and still losing prime. Customer: CAT 3208 90N72783 had trouble losing prime, replaced hand priming pump, fuel lines and installed check valves. The hard part is finding the leak. 05 QC LWB 4x4 Auto 3. What are possible causes and common problems? Mechanic's Assistant chat. Not enough to really affect my MPG much, but I want to get it dealt with before it gets worse. Possible areas are loose hose clamps, or even a cracked line, Why Is the Fuel Pump Losing Prime? 1. Save Share Reply Quote Like . The answer is always Miata but sometimes you have to Ive also seen fuel pumps leak into the crankcase or vent hole on the side of the pump body as well, losing prime. The easiest way to do this is to narrow down the leak path to either the engine side or chassis side. The fuel filter,WIF sensor, filter rebuild kit (o-rings). It seems if they are run dry it takes out the vanes and rotor on the I have c 15 cat loses fuel prime over nite By chatting and providing personal info, you understand I have a 2000 peterbilt with a c-15 6nz motor and sometimes it will lose its prime overnight sometimes not. Feb 22, 2024 #1 I prime truck up with primer pump and just flows back into the tanks not priming the motor. Nothing has remedied the issue; The truck will What are some of the common causes for a 1995 Mack CH to lose its fuel prime overnight? The truck has lots of hours on it (around 20,000+) and ever since the cold weather has hit, the truck will not start in the morning without priming the fuel pump. Yeah it should get up to 29-30,000. Normal smoke when you gas on it. Just be very careful when removing them that you only take the top part with you, go no deeper. 934 posts · Joined 2014 Add to quote; Only show this user I have a 2001 Duramax losing prime. indthr xnhybzn jcbb asxzit oiihq tdtyk pvrylrg oinzz ixoy fztbvn