Fuel Pump/Pressure Regulator diagnosis?

[drhill]

Hi everyone,

I recently got a check engine light for the electronic fuel pressure controller that sits on the fuel rail.

I checked fuel pressure manually with a gauge on the shrader valve and I saw about 10psi or a bit less with the turn of the key and about 30psi once the car started. I rev'd it and it stayed about the same if not dropped a few psi with higher rpm. If I pulled the vacuum from the electronic regulator on the rail it dropped to about 20 psi and would stay there even when I plugged back in the vacuum line.

Is this normal? I'm trying to determine if I have a dying fuel pump or a dying electronic regulator...

Also - if my pump is going out - what's a good replacement for my car - approx 425 rwhp...I have read the stock pumps are pretty good...

Thanks for the help!!! :beer:

[drhill]

Mainly concerned if I need to replace the fuel pump - I've read on the forums that 39 psi is normal and I've read 30 psi is normal...just need someone to chime in what is the correct pressure...thanks guys!!

:banana2:

[Comin' in Hot]

from everything I've read or seen, it's 39 psi, anything less and your pump is on its way out.

[EMAS]

There is no regulator per se there is a pressure sensor and the computer runs the fuel pump as necessary to get the pressure at the desired setting.

[RF Overlord]

...and yes it's 39 PSI.

[drhill]

Ok great...I assume 39 psi with vacuum to the frps and not unplugged?

[drhill]

just changed fuel filter: less than 5 psi at startup, less than 20 while running, no matter if frps was plugged in or not. Took it for a short drive....no power to speak of. Fuel pump it is!