im having a big problem with my truck when i downshift or sometimes even on easy throttle the power to the dash and tst box and everything else including the lift pump will stay on but the engine just dies and it takes several tries and pumping the pedal to get it to crank back i just put a new lift pump and hot rod vp44 on it cuz we thought that they were the initial problem but it didnt change anything i even had the computer reflashed at a dealer could it be a throttle positioning sensor or may i be looking at alot more money?

 

any codes on the truck.

 

No codes it actually made a loud pop out of th exhaust and quit runnin we sent the ip off to industrial to be looked at and they told us that it was done for its the third one I have had im just gonna p pump it now. Haha

 

But you clearly have an issue besides the pump. You need to figure out what's killing the vp. They don't just quit. Do you have fp gauge? What lift or pusher are you running?

If your pump came from industrial they warranty em, unless you seized the rotor, which basically means you ran 0 fp for X amount of time. They say anything about that?

 

Sounds like when you let off its letting air get into the fuel system. But i could be wrong just a thought.

 

the lift pump has run a constant 25 psi at idle and at wot it didnt go below 15. it turned out it was the vp i shifted into third the other day and the engine reved on its own and made a loud pop out of the exhaust and wouldnt crank back