I installed an FP gauge a couple weeks ago and now all of a sudden it reads zero. Before it was reading about 45psi at idle and around 52psi at WOT. Its a glowshift product that works off of an FP sending unit which is a variable resistor to ground. I measured the voltage at the sender to be 180mV (and 0 on the ground side). I don't know what it was when it was working. I just put an email into glowshift but they usually take a while to get back to me.

I haven't tried disconnecting ground to see if the gauge will peg to 100psi.

Anybody have any ideas.?

 

flick the screen....my needle somtimes sticks at 0.

 

I tried that... it didn't help. Plus the gauge sweeps to 100 at turn on.

 

My question is why the heck is your pressure so high before?

 

I don't know. What is it supposed to be?
I was going to check it with a regular gauge to see how accurate the sending unit is but I haven't gotten around to it yet.

 

because he has good oil pressure.

 

What does oil pressure do to your Fuel pressure?

 

ive seen fuel psi be around 38 on average when car is at operating temps. with the koeo it will go up to bout 45 psi. try flicking the sending unit with a screwdriver head and see what happens.