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Problems With Fuel Pressure Gauge

3471 Views 8 Replies 3 Participants Last post by  jrglenni
I've been having problems with my fuel pressure gauge every since I installed it. The reading bounces around all the way from 0-100psi for no apparent reason. Sometimes its while I'm cruising, other times it's when I accelerate, sometimes it's when I let off the gas. Every now and then it seems to say steady at approximately the right pressure, right around 38psi. I checked the wiring and I'm pretty sure it's ok. I have a Zex wet nitrous kit so I put the electronic sending unit in between the fuel feed line and the NMU, which I assume should be fine.

I sent the manufacturer an e-mail and they didn't give me much to go on but said that the gauge wouldn't work on a return-less style fuel system. Has anyone heard of that before? It seems like the gauge should work no matter what type of system it's on. I'm thinking it might be the sending unit or the gauge itself. Anyone have any idea what might be wrong?
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I've had an AutoMeter 5673 electric gauge installed for almost 2 years with zero problems. Yes, it jumps around some, but it is totally in synch with throttle movements. The pressure that is held all the time while off is around 50 psi.

Out of curiosity, does the sending unit have a diaphragm or is it completely electronic?
From the size of the sending unit, I'd guess it is electronic.

I said it jumps around- that is only in response to the different throttle positions, otherwise it runs really steady. This AutoMeter Fuel Pressure and the matching electronic boost gauge have worked flawlessly for right at two years and 20,000 miles.

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