I have a 05 LLY with 43K.. Never any problems till 2 weeks ago when I got in truck an it took several cranks to start "3-6".. Trk was finefor another week of driving no problems what so ever till a wk. ago got in cranked up turned on air an trk went dead with no restart. Hauled to d-ship they said it would not crank when they got to it the next morning but they did not have there equipment on it that time an so for the next 2 days it cranked an everything was ck'd out fine. So tech was lke sorry I can't find nothing wrong. I was like WTF now I have a intermittent problem.. So he gave me this thing that sits in the cupholder an plugs into the ADL connector in event the trk acys up again. Well just now I was backingout of my parking space an the darn thing went dead. I went thru the recoding procedure 4 times with the device. Then I thought why not call OnStar an see if they show anything. Well guy said everything was clear an it must not be anything linked to the main computer..:help:

Please post a signature of what accessories you have installed on your truck. This will help people on this forum diagnose the problem.

O an by the way when I went back to the dealership I walked in an over heard the tech that was working on my trk to the service manager an the conversation went like " I can't really tell whether or not he has had a programmer on the trk cause everything lines up on my end". I figure they were trying to find a easy way out an void my warranty .. Although I do have a programmer "Predator" I did just get the stk. tune programmed back in beofre the roll back tolled it away. Also I do not have a cat onthe trk so not sure if they will try to void my warr.cause of that. There use to be a guy on here called "DURAMAXTECH" or something like that. I would like to see what he has to say about all this or anyone else with similar problem.. I also told the tech that I heard him talking abotu the programmer an also he called me an ask me if I ever had one on it. "I forgot about that" an I of course said no. I told him that the dealership where my friend bought his trk they sold him a programmer with the trk an he said we do not do that here. Here "we void your warranty, those modules do not give you that much more power anthey tear up trk's..""

AFE ST 2 INTAKE
MRBP 4" Downpipe back Exhaust NO Cat
Predator Programmer

Like I said before never any problems what so ever till here recently.. Could bad injectors cause this??

I have a 05 LLY with 43K.. Never any problems till 2 weeks ago when I got in truck an it took several cranks to start "3-6".. Trk was finefor another week of driving no problems what so ever till a wk. ago got in cranked up turned on air an trk went dead with no restart. Hauled to d-ship they said it would not crank when they got to it the next morning but they did not have there equipment on it that time an so for the next 2 days it cranked an everything was ck'd out fine. So tech was lke sorry I can't find nothing wrong. I was like WTF now I have a intermittent problem.. So he gave me this thing that sits in the cupholder an plugs into the ADL connector in event the trk acys up again. Well just now I was backingout of my parking space an the darn thing went dead. I went thru the recoding procedure 4 times with the device. Then I thought why not call OnStar an see if they show anything. Well guy said everything was clear an it must not be anything linked to the main computer..:help:

Hope you find the problem. BTW the word in and, not an. :)

Ye syou sound like my wife>>>:blahblah: She always gets me for this "an" that.. Hey man could a bad injector be a intermediate problem>>???

sounds like a tough dealer... i know whenever i have a dmax with a problem it's the first thing i ask is if there is a programmer installed. 90% of the time the customer gets defensive like i'm trying to void their warranty when in reality i am trying to figure out if i can do a reflash if necessary. Most dealers can careless if you have a programmer but others get huffy puffy. oH well, back to your prob.

When it shuts off do you lose all lighting on your dash or do your gauges still work? Does it stumble and die or just instant off? When you try to restart does it crank and crank or no crank? If you have it to where it stalls on you, get out and pump the primer to see if it builds up pressure, and does it then restart? Sorry for so many questions but it is odd that no codes are set and it's tough without the truck in front of me.

New Update. I just went out after some reading an pump the primer a few times then I unsrewed the bleeder screw an it seemed maybe fuel did not imediately come out but Imight have not had it unscrewed enough, tightnen it back up. Anyways went to try to crank an nothing.. Then I went back an pump the hell out o f the primer maybe 10-15 times , then tried to crank it an it fired right up..:rolleyes: To answer your ?? Yes the trk would just go dead like someone pulled the plug. An then it will just crank an crank an crank. Any ideas now??

you are getting air in your system. You just need to find out where now.... When was your last fuel filter change?

Fillter was changed 2000 mi ago @ 43K not has 45K... Seems like the probles would occur all the time if it was air. But could it also be that it only occurs when the gas gets low enough inthe tank to where it sucks air ...:o:

Fillter was changed 2000 mi ago @ 43K not has 45K... Seems like the probles would occur all the time if it was air. But could it also be that it only occurs when the gas gets low enough inthe tank to where it sucks air ...:o:


thats a possibilty, but i would also check the fuel filter housing area. Clean up the top of your housing and pump the pumper till it gets hard. With a flash light watch your bleeder screw to see if any fuel comes out. If even the slightest bit comes out replace the bleeder screw. Could be an internal problem with your housing or could be a bad O-ring in your fuel lines on the driver side of the motor. There are many possibilities but it really sounds like air is getting into the system.

There are many possibilities but it really sounds like air is getting into the system." What otehr possibilty's fo you think?? I mean if I had to pump the primer then it would definitely be something to do with fuel supply!! correct?? Ok I just went out an puped the primer while inspecting everything around the housing for leaks an saw nothing. However the small plastic thing that screws int he bottom of the filter with the electric wire that the "tech" did not plug back up an why did GM make this wire so short?:rolleyes: I saw that there was diesel that was streaming out!! I cannnot tell if it was literally coming out the plastic nipple on the bottom or if the tech did not tighten the threads enough upon reassembly. I then tried an the trk fired right up an upon inspection during idle the diesel was not coming out. Is it normal for diesel to come out the bottom during a priming procedure?? This was after I really got the primer pumped up by the way..

There are many possibilities but it really sounds like air is getting into the system." What otehr possibilty's fo you think?? I mean if I had to pump the primer then it would definitely be something to do with fuel supply!! correct?? Ok I just went out an puped the primer while inspecting everything around the housing for leaks an saw nothing. However the small plastic thing that screws int he bottom of the filter with the electric wire that the "tech" did not plug back up an why did GM make this wire so short?:rolleyes: I saw that there was diesel that was streaming out!! I cannnot tell if it was literally coming out the plastic nipple on the bottom or if the tech did not tighten the threads enough upon reassembly. I then tried an the trk fired right up an upon inspection during idle the diesel was not coming out. Is it normal for diesel to come out the bottom during a priming procedure?? This was after I really got the primer pumped up by the way..

not normal, quite possibly you found the problem.

As far as the plastic round housing that screws into the bottom of the fuel filter. What is the small plastic *** for?? It was hard to tellof fuel was either comingout of it or the nipple itself. I would think that there would be more PSI with the motor running then say the most I could pump by hand that previously made the fuel come out, so I obviously thought it should have been coming out with the motor runnuing,but that was not the case.. I guess I will have to take it apart for closer inspection. Hopefully this is not just becuase the tech only hand tighten the plastic part inthe botoom of the fuel filter..:o: Also what is this part for?? Isit a fule heater hence the wire??

it's a fuel water seperator and the wiring is for the sensor to see how much water is in there. You don't want it too tight...

So in theory if there is too much water in there that small nipple on the bottom will drain off the excess water??? Yet I possibly had diesel coming out mine!! If the seperator itself is not tight enough or possibly cross threaded could it suck air an cause air inthe system? Sorry for all the ???'s But I haul my race car wit htis trk an have a race coming up an it seems I may be the only one who can fix it. Not with out the help you have gave me of course:ro)

So in theory if there is too much water in there that small nipple on the bottom will drain off the excess water??? Yet I possibly had diesel coming out mine!! If the seperator itself is not tight enough or possibly cross threaded could it suck air an cause air inthe system? Sorry for all the ???'s But I haul my race car wit htis trk an have a race coming up an it seems I may be the only one who can fix it. Not with out the help you have gave me of course:ro)

don't mind the questions.....

the fuel/water seperator won't bleed off on it's own it will just store the water at the bottom until the drain is opened or the filter replaced. You could have air entering the system if it's not completely sealed up. Most common air in fuel problems are caused by an incorrectly installed filter/ leaking bleeder screw.

an incorrectly installed filter/ leaking bleeder screw" I replace my own fuel filters an it seems pretty straight forward to me.. Unplug wire on bottom unscrew filter unscrew water seperator an then reverse//.. Although it is hard sometimes to get the filter to thread back on with out cross threading..

an incorrectly installed filter/ leaking bleeder screw" I replace my own fuel filters an it seems pretty straight forward to me.. Unplug wire on bottom unscrew filter unscrew water seperator an then reverse//.. Although it is hard sometimes to get the filter to thread back on with out cross threading..


it's very straight forward however you are dealing with O rings and they are able to move around. once the fuel filter is in place it is hard to tell if the O ring is completely sealed. Best way to tell is to pump the pump and look for any leaks which you did so you should be all set.

Except for the fact that after many hand pumps I have diesel streaming off the bottom of the water seperator.. It streams for a good minute then dies down.. as you have said thisis not normal so therefore either the plastic housing on bottomis cracked, o-ring in housing is not seated or tech did not tighten housing enough.. I cannot see how this filter is not leaking whilethe motor is running it would see there would be more PSI then!! But 1st things 1st is finding out why the fuel filter is leaking on bottom when the prime is to the point where you can baely pump it..

pushing the pump creates pressure in the fuel system. When the engine is running the fuel system is under vacuum. So tahts probably why you don't see it while it's running. I'd pull the filter and take a looksie for visual cracks and check the o rings, maybe there are signs of it getting pinched or cut. Maybe a crack in the seperator drain too lik you said. You are on the right track.

This really sounds like a filter problem. Best thing to do is go buy and install a new filter. Replace the 2 O-rings(supplied w/ filter). My guesses are a loose or cross threaded WIF sensor, missing/damaged O-rings, loose filter, or cracked bleeder screw. You can order a STS bleeder screw, then you won't have to worry about that, especially if you live in the cold country. :grd: