Duramax Losing Prime!!! - Diesel Bombers



Chevy/GMC Truck and Duramax Turbo Diesel Forum Discussion of General Topics related to All Chevy and GMC Trucks as well as the Diesels in them

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  #1  
Old 03-12-2009, 04:15 PM
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Default Duramax Losing Prime!!!

Hey guys, I know this is a fairly common problem, but what the heck gives???
I just changed my fuel filter, no leaks anywhere, had the whole fuel system inspected 3000miles ago and they said it was perfectly fine, didn't throw any codes. I just picked up a Bully Dog tuner from GRI that I haven't had a chance to try yet, so I'll check for codes when I can, but does anyone know WHY they lose their prime? Where are potential problem areas? After pumping the fuel pump a couple times, it fires right up...
I let it sit for 4 days and it wouldn't start, had no pressure, I had to pump the manual pump until it was firm for it to start. Could it just be a cold weather fuel issue?


Thanks for any tips

---AutoMerged DoublePost---

hmm... I'm thinking - it's not tight enough or I didn't tighten the bleeder screw enough, or it's the crap fuel that's in my tank right now or a combo of both.... Maybe something came loose after I installed the new filter..

Last edited by K50; 03-12-2009 at 04:16 PM. Reason: Automerged Doublepost
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Old 03-13-2009, 12:44 AM
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the filter and the bleed screw should be hand/finger tight and it should be fine. How cold is ti up there?
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Old 03-14-2009, 02:06 PM
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I just had to have my water sensor replaced on the bottom of the fuel filter. The bleed (drain) valve just started leaking (dripping) diesel and the valve has never been opened. It started losing its prime slowly and with a very slow drip out the valve.
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Old 03-14-2009, 05:21 PM
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all them stuff can be hand tight, the wif sensor can be wrenched on, but not too tight
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Old 03-14-2009, 05:57 PM
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An easy way I have found to see where fuel is bleeding off is to take a piece of clear hose about 7ft long and connect it to the inlet of the cp3 and to the hose connected to it. This way it is inline and just hang it from the hood. See which side leaks fuel down. That will tell you which way the fuel is going. That will help figure out where to start looking.
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Old 03-14-2009, 08:52 PM
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Quote:
Originally Posted by cbrew2001 View Post
I just had to have my water sensor replaced on the bottom of the fuel filter. The bleed (drain) valve just started leaking (dripping) diesel and the valve has never been opened. It started losing its prime slowly and with a very slow drip out the valve.
I had to do this also, truck kept losing prime.
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Old 03-14-2009, 10:00 PM
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Fixed now though, I must have bumped it or messed it up on the last fuel filter change.
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Old 03-16-2009, 10:32 AM
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Well, this weekend my truck seems to have been running better, but I'm wondering if the WIF sensor as Danny mentioned might be starting to develop a mild leak. I ran all weekend with no more issues, but thanks for all the tips guys.
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Old 03-16-2009, 09:36 PM
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the wif sensor does use an o-ring to seal it up
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  #10  
Old 03-25-2011, 12:31 AM
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help help please i have a fire dept truck 2007 with a duramax it wouldnt start, so one of the firement changed the fuel,filter,, pumped it all upm and bled it it started up and drove for that day , then after shut off it wont start , no fule presure on the rail at the shcrade vale at all, hand pump it a few time and it aill start and run f ro a few seconds then die, according to gm there isnt a pump in the tank on this 2500 and i cant find a rail pump either, id the only pump on this truck the injector pump? funny thing is this one of the fireman actully beat n the fuel tank and it started the tohter day (like a gas motor with a bad pump) help help im doing this as a free help thing for the fire dept as im so close to them , im kinda an idiot with thses engines..
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