Late last week I rinsed some more oil from my fenderwell, and think I may have gotten the sending unit for my fuel pressure gauge wet.
Its been wet before and never did this stuff.
I dried it with a compressed air gun.
The next morning my fuel pressure was reading 80psi+, now it is varying from normal 55-60psi up to 80psi off and on.
80psi was seen at start up and while driving normally on the freeway and in town.
Could this be my pressure regulator?
If so what is the best remedy for fuel pressure regulators, replace with stock or is there something out there that's better but doesn't cost $100.00 plus like everything else?

 

I had a problem with my auto meter fuel pressure gauge, After about a hour of driving the gauge would creap up to 100 PSI. I pulled the seding unit and it was still reading over 90psi sitting on the throttle body lol, I'd check your fuel pressure with a know good gauge and go from there. How does it run when the fuel pressure starts jumping around?

 

Runs fine really, thinking it just may be the sending unit??
I'll have to take it out and pound it a little and report back.

 

do you have a mechanical gauge you can test it with?

 

Unfortunatly, no. The sending unit is plumbed into the port where the schrader valve was. I'll ask my neighbor when he gets home if he's got one, or maybe hit up a friend at the dealership to be sure.

 

Did you happen to check the ground? I had a ground issue that made mine 5psi short all the time. Took me forever to figure that one out. Those things seem to be finiky with their wiring.

 

Haven't yet but I will now.
I remember when I first installed it, the anodizing kept it from getting a ground through all the fittings, using no thread sealant or tape!
I had to band clamp a ground wire to the sending unit.
Band clamps seem to be my best buddies these days.
Thanks for reminding me.

 

You had to run a wire to the side of the sender to ground it? I think I just got lost.

Those three wire pressure sensors don't ground throught the fitting.
One wire for power supply, one wire for 5 volt ref return to gauge, and one for ground.
If your gauge reads differently with the sensor housing grounded I'd say the sensor is no good.

 

Its right inthe Stewart Warner install directions. They say clearly that it grounds through the thread contact and that sealant or teflon tape can interfere with than ground.
There is only one wire becuse it is a mechanical sending unit I beleive. You can see it on some of my photobucket pics. Too lazy to take more pics and post more up, I'm getting high speed internet this coming Friday then look out! I'll be posting everything man!!

 

With our manifolds, you can't get a ground through the threads anyway. I soldered the wire to the sending unit. I have a dak digital and I agree with Krambo... the wiring is flat out weird.

I had huge problems with mine because I grounded the gauge to the inside of the firewall and the sending unit to the outside... I had to give them the same ground to alleviate the problem.