2000 gmc 2500HD 6.0 gas

BrandonS95 · June 30, 2015

My truck has had a cranking issue for the past 5 year. I wouldn't think it's the fuel pump because I wouldn't think it would last that long. I just got the engine service and all new gaskets on it. I just had a brand new fly wheel and timing chain put on as of 6/28/15. I'm very confused. Please help. By the way. When I say cranking issue I have to turn the key 3 to 4 times before it will actually crank.

oldscsc · June 30, 2015

Check fuel pressure at the Schraeder valve. Key on, engine off. Spec is 55-62 PSI. These pickups are very sensitive to pressures lower than that. Just a couple PSI lower than spec will start to cause issues.

davester · June 30, 2015

I would think that having to turn the key multiple times before the engine cranks [not starts, but just turns over] and that during the first few times you turn the key, you don't hear the starter, indicates an electrical problem between the battery, ignition key and starter.

Probably first check that the starter relay is working properly, then test the starter itself is being properly energized.

Edited June 30, 2015 by davester