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..

---AutoMerged DoublePost---

also i might add this has the edge chip on it and for some reason i canrt read the code on the computer ,

 

The cp3 is the lift pump

 

yep the only fuel pump is the CP3, and its buried in the valley

 

should also have a pump on the fuel filter. also the fuel filter could be clogged. or you have a leak somewhere. i know on my truck i have a small leak on top of the fuel filter housing and if my truck sits for more than a day or two i have to go out a pump the hand pump on the top of the filter to prime the system. Its a leak that allows air into the system which inturn allows the fuel to flow back to the tank. So i dont have a visible leak because it is higher than the fuel level its self.

If thats not an option for you, you could invest in an after market lift pump that is installed right at the tank, which should ensure positive fuel flow to the eng cp3. Worst case senerio your cp3 could be going out.