duff0000

Today I noticed that my fuel pressure was at 85psi at idle, is this normal? If i remember correctly when I first installed my comptech S/C fuel press. was at 50-60psi at idle. Everything seems fine but the high fuel pressure kind of scares me. Is it ok to drive?

at idle, 80 deg. outside

spoiled@21

If the gauge is right I don't beleive that factory injectors will stand that kind of pressure for long. Some one correct me if I am wrong.

it will run, really rich at that, until one of the injectors fails.

Scorpion

Stock FP is 47, that's with the vacuum line removed from the FPR. 80psi is way to high, again if the gauge is reading correctly.

duff0000

What I need to do is get this thing to a dyno and figure out why the fuel pressure is high, This could not be from having a testpipe and an exhaust could it? I know it the TP and exhaust can effect richness/leaness but fuel pressure? I doubt it.

Or I use someone else's gauge to make sure its reading correctly.

duff0000

Ok well I tapped the gauge a couple of times when the engine was off, the needle moved slightly, started the car and it read this:



It has to be the gauge, unless somehow the fuel pressure can jump 20psi in 10 mins. without messing with anything except for tapping on the gauge.

WLAURENT

I would replace the gauge ASAP. I would have to think that it is defective.

duff0000

why ASAP? Is there a danger to me if I drive 100 miles with a defective gauge? I plan on getting a new one the end of this week.

The car is stock except for the s/c testpipe and exhaust

Scorpion

There is no danger, just get a liquid filled next time

Spoolin

I have RC 750cc injectors, a wahlbro 255 lph pump and an AEM FPR(a 1:1 regulator). My idle pressure is set to about 47-48 psi with the vacuum line connected and with a blip of the throttle, it jumps to around 56-57 psi. Does this seem about right for my setup?

MugenRioS2k1

Not to scare you any but I would replace the gauge ASAP.
Go to autozone and get a cheep one for now.

If you look at the gauge and it starts to "pinwheel" better shut off the car right away. When a Gauge starts to pinwheel it is a sure sign the gauge is about to rupture.
I have only seen this pinwheel effect on very high pressure lines (10K-60K) those gauges do not have nettle stops on them for this exact reason.
It looks like yours has a needle stop so If you ever see the nettle pegged on the bottom of the stop (fully loped around) I would not trust it to hold under any pressure.

In this case if there was a rupture it most likely would come from the middle of the needle attachment and fill the gauge face with fuel with a possibility of fuel pushing out though the gauge face cover causing a very hazardous condition.

In the case of the high pressure Gauges pin-wheeling the gauge literally explodes.