Thanks for the reply! Everything makes sense now I read that thread you linked me. I did not know that when cranking the truck the ECM sends power to the Lift pump. When started the OPS takes over. I measured the voltage on the LP while a buddy of mine cranked the truck... So it probably never received enough/any power while running.. Makes total sense now. Will order a new OPS tomorrow and I'll work on that relay mod after, thanks!:thumb:I would install a fresh OPS with that new lift pump.
1995 trucks need the OPS relay mod installed to help take the electrical load off of the OPS.