Hi, thanks for reading my post - here is what I've got. 1969 Camaro with a autometer fuel gauge
between the speedometer and tachometer. I'm trying to install a factory center fuel gauge from Rick's Camaros
and I can't get it to read above 1/4 tank. I've read through the posts here and have tried the following with no results.
Check the gauge:
Disconnect the sending unit wire, the gauge goes to full. Ground it and the gauge goes to empty.
Check the sending unit ground:
Cleaned the ground connection for the sending unit near the mounting strap. Fill the gas tank, still reads 1/4 tank.
Check the sending unit (repro):
Drain and dropped the tank.
It has a good ground connection to the sending unit body. I pulled the sending unit out of the gas tank and did some bench testing.
1) First test with my autometer fuel gauge, I was able to get a correct reading (empty to full) when I moved the lever up and down.
2) Hooked sending unit up an OHM meter and got correct 0-90 OHM reading.
3) I hooked up my new center fuel gauge, still get 1/4 tank when I move the lever to full position.
Bought a new Spectra Premium Sending Unit:
Thought my repro sending unit might not work with the OEM center fuel gauge. So I ordered a SPI sending unit and did the tests above. Same results, only 1/4 tank reading.
Resistor on the back of the gauge:
Put a new resistor on the back of the gauge (from Rick's Camaros
). Bench tested, same result - 1/4 tank.
Check the gauge again - with a potentiometer:
This result is kinda weird. I hooked the pot. up to the gauge, the gauge will sweep from empty to full between the 0 - 10 OHMs (according to my OHM meter). The gauge will not respond between 10-90 OHMs when I turn the pot.
Do you guys have any further suggestions? I suspect it might be the gauge with the weird reading I am getting from the potentiometer.
1969 X-22 SS 396