Ok, installaed new electric fuel pressure gauge. Gauge reads about 14 psi. Just sits there, no movement. Goes to 0 with power off. Goes to 100 psi if I remove the sending unit wire, goes to 0 if I remove the ground wire. This would seem the gauge is working. I'm on my second sending unit from summitt. Double checked all connections, even rewired twice. Sending unit is mounted at the schrader valve. I had a mechanical under hood gauge there before installing this gauge. Was getting normal readings prior to this install, so fuel pump is working properly. I am at a loss and ready to send everything back to summit. Anybody with some input that I may be missing would be greatly appreciated. Thanks.
Help with elec. fuel pressure gauge
- Thread starter conv91lx
- Start date
I have NOT installed an electric fuel pressure gauge but if the sending unit is like others, ensure that it has a clear continuity to ground. We dope the threads up and this can interfer with the ground. In the past, I've had to manually affix a ground wire to my sending units for this reason.
For a quick test of this (if needed or applicable), you can do this with a jumper wire with aligator clips on each end.
Good luck.
For a quick test of this (if needed or applicable), you can do this with a jumper wire with aligator clips on each end.
Good luck.
Yes, I have confirmed that it is grounded, I should have mentioned that in original comments. Used the adapter that came with unit to mount to schrader valve. I'm starting to think the gauge actually is bad! Now does the sending unit turn the pressure it sees into some kind of measurement in ohms that the gauge can read? I hooked up my multi meter to the sending unit wire and the ground. Read a steady 13 ohms, no fluctuation. Have no idea if this is how I should have been trying to diagnose. Getting pissed, gonna call summit tomorrow.
Did ohm test. Got less than 1 ohm. Like .2-.3. This i'm sure is good. Definately grounded. Wondering if sending unit isn't seeing pressure. Can't for the life of me, see why not though. Do have a couple different size adapters on schrader valve to get the unit to thread on. Unless one of you amaze me with a miracle cure it's going back monday.
Did you have to remove the Schrader valve core? That would be the one thing that could hang it up, I suppose.
If you have a spare air/oil separator (for your air compressor), you could connect it to the sending unit (separator outlet), while your compressor hooks up to the inlet. You will know how much pressure is going in because of the compressor's regulator. See if you can make the gauge read something different.
If you have a spare air/oil separator (for your air compressor), you could connect it to the sending unit (separator outlet), while your compressor hooks up to the inlet. You will know how much pressure is going in because of the compressor's regulator. See if you can make the gauge read something different.
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