Here we go again same symptons again and again. 2004.5 chevy that runs for 30 seconds with out hickups no surging sounds good but dies after 30 -60 seconds. The primer is soft after dying and once reprimed 3-5 times it fires right back up then dies. Changed fuel filter, ran 2 cycle oil through tank, (8 ounces) along with diesel Kleen, changed bleeder screw on top of priming unit, changed bottom water seperator plastic screw in sensor.
Had edge w/attitude on took that off and it's been off for 2 months reset program to stock, checked pins on harnesses found one pin just a tad loose pulled it back to level with others but don't think thats the problem. Okay guys help me out.... I need my truck..
What about a fuel pump issue...if she's not gettin' fuel, loses prime andthen dies. Experience in life has taught me to eliminate the impossible and whatever is left however unlikely must be true. also, its probablt the easiest thing to check.
Check the black bleeder screw top of the fuel filter housing. If this is loose, your fuel will run back to the tank. Also check the water sensor on the bottom of the sensor and make sure this is tight.
__________________ 2003 GMC Sierra LB7 ATS *EXTREME* Transmission, ATS Billet Flexplate, ATS Aurora 5000, 4" downpipe to a 5" Single Stack, ATS Epower Programmer, Custom 4" Intake with AFE Filter, ATS Billet Tie Rod Sleeves, FASS 150/150 www.atsdiesel.com 866-230-4092
Checked both already, replaced black bleeder screw and it's tight, also replaced WIF sensor and it's tight. When I bleed the fuel through the bleeder screw it comes out good without air. Any more ideas...???
I found after shutting off engine that I hear a air leak coming from the fuel filter housing area. I moved some of the hoses around and the air lasts about 10 seconds after the engine shuts down. Any suggestions?
I wonder if somehow the fuel returning to the tank is pressurizing the tank. This sounds like what you describe. Try running the truck with the fuel cap loosened a little. Have you made any changes in this area? (locking fuel cap or moving the vent hoses?) The plastic fuel tank probably expands quite a bit, enough to push air for a few seconds anyways.
You must have an air leak. Pump the hand primer until it gets hard. This pressurizes the fuel filter and the hose between the fuel filter and the injection pump. Check for fuel leaks all around the fuel filter and hoses. No fuel should leak at all. Also, when you are pumping the primer, do you hear a sucking sound? It may be hard to hear. The reason why I am saying this is because I had a LB7 that had a small pin hole in the FICM (the computer next to the alternator) This was difficult to locate because this part of the fuel system is under a vacuum while the engine is running. So it will not leak fuel out but will suck air in. This hole was on the back of the FICM about 1-1/2 inches below the top fuel line connection. I used a piece of 3/8 rubber fuel line, one end on my ear and the other end on the back of the FICM. When the rubber hose gets near the hole you can really hear the leak. I had another guy pumping the primer while I was moving the hose around.
Another note.. I forgot too mention I have a after market fuel tank on the beast. 45 Gallon tank and it's metal not plastic. I haven't tried loosening the cap yet. Looks like I'll be taking it to the dealership Tues.. I'll see what they say.
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Engine dies 
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