munson

Hey all!, let me first say what a great site. I was on TDR for a few years and learned alot there, but this seems to be just as good if not better. I was wondering about a my fuel press guage. I am on my 2nd lift pump and 2nd injector pump. I decided to get a fuel pressure gauge installed when i got the injector pump installed. Problem is that the gauge will indicate all is well (14 psi @ idle, 12ish when holding 65-70 mph), but then it will just drop down to somewhere between 7-10 and stay there for awhile. Sometimes it will come back up on its own, other times if I give it a little throttle, it will jump back up to where it needs to be. There is no change in performance when this happens. It almost feels like it is a bad gauge and not a fuel problem. Has this happened to anyone else?

Fishin2Deep4U

Lift pump is gone. Bypass is sticking open.

Dave

wcbcruzer

Is it an electric gauge? If not, are you using an isolator. Both of those are known to go bad.