[scott88]

Hi all, I was doing some driveway data logging this afternoon and noticed my fuel pressure was bobbing up and down at idle (is normally at 38 psi or so at idle) and nothing in the data log for fuel was changing at all. Then the gauge dropped to zero, but the car didn’t even sputter or change at all. AFR was steady- if I lost fuel pressure I assume the car would either go very lean or not even run, correct? I’m guessing the sending unit is faulty, since I shut it off and started it up again and the gauge was fine for a couple minutes then started acting fubar again. I have an auto meter full sweep 0-100 psi electrical gauge with sending unit hooked up.
A new sending unit is already on the way but I just wanted to verify if I was in fact losing pressure that I would see it in the datalog or the car wouldn’t even run at the very least.
Thanks,
Scott

[Vortech347]

Yeah, that's the sending unit. Check all your wiring, especially in the back of the gauge. The little pins have been known to come out.

[EDS50]

The only thing I can add is to check the electrical connections on the control box that comes with the gauge if you have that style set up.