LB7 truck died
 

hey guys i got a question. my dad has an 03 gmc 2500hd and he went to back out of the driveway and the truck just shut off and know just cranks-won't start up at all. i scanned codes and got nothing. did the tests for a crank/no start following the gm service manual and led to a faulty fuel rail pressure sensor. my question is Has anyone ever had this issue before and do these engines need to see fuel rail pressure to start?

Thanks

did it run out of diesel? if so needs to be bled

even with an unplugged fuel rail pressure sensor the truck will start and run for at least a second or two. make sure there is fuel getting to the engine first


was there anything recently done ot the truck?

When was the last time the fuel filter was changed? They can be very picky if you don't change it often or if it was just changed the seam may not be good causing it to lose its prime.

nothing recently done to truck,fuel filter was changed like 10,000 miles ago if that.truck ran fine all morning, then that afternoon went to use it and died. i tried unplugging the sensor and just cranks-relatively fast. using my scan tool i can look at FRP pids and the desired is at 45 mpa and the actual is 2 mpa with sensor plugged in and goes to 180 mpa when unplugging the sensor. i guess i'll check to be sure it's getting fuel to the engine-were would be the best place to do that?

Change the filter. With the Duramax's they need the filter changed about every 5,000 miles.

Re: LB7 truck died
 

there is a restriction somewhere in the lines... I hope. Try the FF if you have a vacuum gauge to hook up to the service port that would be nice. But 10k is a long way to go with one ff. Start with that.

Yes start with the Fuel Filter you would be surprised how much that can help.

Thank you guys for all your help, i did all that other stuff for nothing. it ended up being the water in fuel sensor was leaking and sucking air so i just changed the filter-it was due anyway and primed the system and the truck runs pisser know.

Thanks
Matt