s5 TII fuel pressure question

[FerociousP]

ok. Everything is NOT OK. I bolted everything back down and started the car. Fuel pressure stayed at 40psi until revved and went to 50psi. Seems to still coorelate with the battery voltage as I was getting 12.5V at startup and 13.5V volts AFTER i revved. Engine vacuum is at 17inHg and is definitely what the fpr is seeing. After the car warmed up I revved a little more aggresively. It even got a little boost, about 3-4 psi, and the pressure actually started falling!! It fell to just under 40psi as the rpms rose and entered boost. It seems to be doing the OPPOSITE of what it should be! I'm so confused. Ideas anyone?

** With the gauge on the return, I saw NO pressure at all, so I have no restriction in my return line.

With the new (used) secondary rail:

Car off 12V: 40-42psi
13.5V and 17in/hg vac at idle: 50psi
pressure falls with revs

[RETed]

Originally Posted by FerociousP

** With the gauge on the return, I saw NO pressure at all, so I have no restriction in my return line.

This is normal.

I would try and dead-head pressure the fuel pump?
It sounds like the fuel pump might be failing?


-Ted