So in my quest to figure out what is wrong with my lt1 i bought a fuel pressure gauge. Normal is between 41-47 psi with engine "on" and should drop 3-10 psi when the engine cranks. My pressure was at 39 "on" and jumped up to 44psi with the engine cranked. What the hell is going on with my car?

Somone suggested FPR vaccum line, but im not familiar with that.

 

What is it running at idle? does it drop under load full throttle?

Nate

 

running at 44psi idle, dont know under load