Losing Prime - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 07-07-2007, 03:00 PM   eBay Motors  #1 (permalink)
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Losing Prime

I have a 02, 2500 HD, Duramax engine that is losing prime. I have replace both rubber fuel lines coming from the fuel filter. I have replace the fuel filter twice, once with an after-market and now back to the OEM filter. I have replace the water sensor at the bottom of the fuel filter. 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. I'm out of ideas. 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. The problems has gotten worst over time, I used to just park my truck with the engine facing downward on a slight grade and I would not lose prime, but now I'm losing prime everyday. Does someone have any advise?
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Old 07-07-2007, 04:17 PM   eBay Motors  #2 (permalink)
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check that plastic bleeder screw on top. It could be cracked or the o-ring on it could be bad. The only other thing that it could be is a cracked filter housing. Are you sure both o-ring and gasket came off with the old filter? If it is the filter housing, your best bet would be to try and find one off e-bay or contact Eric Merchant at Merchant Automotive (gmdieseltech.com). They are pretty expensive from the dealer. (like $700 IIRC)
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Old 07-07-2007, 04:51 PM   eBay Motors  #3 (permalink)
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I have also replace the plastic bleeder screw with a new one and I did remove both the o-rings and replaced them with a new one. I'll check the filter housing, Thanks
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Old 07-08-2007, 09:20 AM   eBay Motors  #4 (permalink)
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i kinda have the same problem. I keep gettin air in my fuel system after long drives. Once you turn it off and try to start it wont start at all. I have to prime and bleed it like you ran it out of diesel. The pressure is good but theres alot of air bubbles in the diesel. WHATS THIS FROM? Please help. I have changed the plastic bleed screw, new filter and gasket even from the dealer twice!
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Old 07-08-2007, 10:49 AM   eBay Motors  #5 (permalink)
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Sounds like you have the same problem....unfortunately it probably won't be cheap. Sounds like the filter head unit. Probably from your prime pump or if you ever had the dealer change the filter....could have had the "filter gorilla" put it on and crack the housing. How does your water in fuel sensor look? There could be a hairline crack in that causing your problem too and not dripping on the ground.
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2004 GMC 2500HD D/A CC Carbon Metallic w/ LB7
4" turbo back MBRP exhaust, Cognito UCAs & HD tierods
TST Powermax Programmer, Diablosport Predator
305/70-16 BFG T/A KOs on Eagle Alloys Series 187
Clifford remote start. High Idle, Bilstein 5100s, 1.5" lift blocks
CAT fuel filter w/ nicktane adapter
Magnum Force Stage 2 intake with AMSOIL filter
Racor 2 Micron pre-OEM with heater & water sep
Lightforce 140s from Madjackracing
http://WWW.ATPTRUCKS.COM/
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Old 07-08-2007, 01:59 PM   eBay Motors  #6 (permalink)
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Can you just bypass the stock filter, by installing a after-market filter system. The only thing about most of the after-market filters is that theire isn't a priming bulb. Is a priming bulb required?
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Old 07-08-2007, 04:11 PM   eBay Motors  #7 (permalink)
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Yes, there is such a system that most people put post OEM filter and I have seen one that has a prime bulb. I would just make sure that it has a fuel heater if you live in a place that it get cold like below 0...but as far as warranty is concerned, I don't know what the dealer would say if you went in for injectors. Those systems could cost nearly as much as an OEM set-up would. They are nice though since it could be mounted where the second alternator would go.
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2004 GMC 2500HD D/A CC Carbon Metallic w/ LB7
4" turbo back MBRP exhaust, Cognito UCAs & HD tierods
TST Powermax Programmer, Diablosport Predator
305/70-16 BFG T/A KOs on Eagle Alloys Series 187
Clifford remote start. High Idle, Bilstein 5100s, 1.5" lift blocks
CAT fuel filter w/ nicktane adapter
Magnum Force Stage 2 intake with AMSOIL filter
Racor 2 Micron pre-OEM with heater & water sep
Lightforce 140s from Madjackracing
http://WWW.ATPTRUCKS.COM/
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Old 07-08-2007, 08:33 PM   eBay Motors  #8 (permalink)
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EDIT* nvm, found my own answer
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Last edited by duramax06; 07-09-2007 at 10:38 AM.
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Old 07-08-2007, 08:35 PM   eBay Motors  #9 (permalink)
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I took it into the dealer and they traced it down to a a fuel filter. I knew it wasnt tho cuz i just had it changed a month prior. It starts right up like it should after i change the filter. After some miles and driving for at least 30 mins it wont start up. Seems like longer you drive the harder it is to start if it doesnt fully cool down! The dealer looked at the fuel filter head unit and said it was fine. I havent checked the water sensor yet! Goin into the dealer tomorrow for injectors. Should i get a new water sensor?
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Old 07-08-2007, 08:39 PM   eBay Motors  #10 (permalink)
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Do you have a wet spot on your frame? You could pick one up, but I don't know if it will help at all. It could be something associated with the injectors too.
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SOLD
2004 GMC 2500HD D/A CC Carbon Metallic w/ LB7
4" turbo back MBRP exhaust, Cognito UCAs & HD tierods
TST Powermax Programmer, Diablosport Predator
305/70-16 BFG T/A KOs on Eagle Alloys Series 187
Clifford remote start. High Idle, Bilstein 5100s, 1.5" lift blocks
CAT fuel filter w/ nicktane adapter
Magnum Force Stage 2 intake with AMSOIL filter
Racor 2 Micron pre-OEM with heater & water sep
Lightforce 140s from Madjackracing
http://WWW.ATPTRUCKS.COM/
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