Discussion Starter · #1 ·
I have a 99 sierra 2500 6.0L, I noticed it had some trouble starting, so I replaced all the plugs, wires, and fuel filter. It still had the same symptoms, I then did a fuel pressure check and the pressure was 45 psi with the key on and 48 psi with the engine running, I unplugged the vac. line to the regulator and the pressure went up, so I knew for sure it was the pump. I used my engine hoist to tilt the bed, it was alot easier then I thought, I hope this helps out some people.