ok so i have a chevy 2500 6.5 td not getting fuel to the t valve if its running. if i turn the truck off and pull the pump relay out and hook a jumper to it i get fuel coming out good flow but if start the truck with the jumper on still no fuel whats going on im at a lost for ideas need help asap because my truck if my money maker

 

I'm still learning myself but it sounds like a lift pump issue.Does it still run and if so does it run as good as it always did.

 

its not the lift pump i replaced that already.

 

Maybe you will get lucky and Mayhem or racer55 will chime in here because that is odd?

 

What kind of LP did you put in the truck ??what brand???

 

Ac delco and I have on from ssdiesel supply truck has New ops ac delco

 

Is your truck OBDI or OBDII??

 

obdI ITS A 95

 

You might want to do the OPS mod located here
OPS relay install - Diesel Place : Chevrolet and GMC Diesel Truck Forums

 

Check for power on the orange wire in the OPS harness.
If power there jump the orange and grey wire to confirm the circuit is ok-it should run the LP.

If not diagnose the break in the grey wire.