About20ninj45

Question. What are you guys fuel pressure at the rail with the supercharger at idle?

Would also like to know fuel pressure at idle for vehicles with the flex fuel pump from 99-2007 classic

FFDP

iTrader: (2)

GMT-800's were designed to run at 58psi.

The later model trucks can vary in pressure with computer control fuel pump modules.

madmann26

iTrader: (7)

At idle it should be stock pressure.

You're not building boost at idle so pressure will stay the same.

Fullpower

my 2002 flex fuel has STOCK fuel pressure regulator:
static pressure, key ON at 58 psi.
Idle FP is around 52 psi.
Highest I have noticed is about 68 psi on heavy throttle.

About20ninj45

Just wanted to confirm my readings, my fuel gauge was leaking at the fitting and iI need to know what koeo, and idle pressures should be. Thanks guys...

I'm too afraid to keep it running until I can figure out how to stop this leak from the screw on fitting on the rail.