fuel gauge folly
Mike - can I do this to my fuel sender unit when it's out of the car? I have a spare sender unit in the basement that I'd like to calibrate and use. BOB
I think that it will be hard to do much calibration with a sender on the bench. You won’t be able to relate the sender position to gas level unless you have an old tank to cut up. I think someone on this site has done this. I “borrowed” a lot of other folks research.
If you have the sender out, I would do the following:
1. get all the gas out of the tank
2. Adjust the sender float so it at the bottom of the tank.
4. Hook up meter match. You can do this in the driver kick panel.
3. Assuming 18 gallon tank, do what Lord Sparky did (only backward)
4. Set meter match so the gauge reads empty when the tank is empty.
5. Put 6 gallons in the tank and set meter match to mid low and 1/3 tank on gauge
6. Put 6 gallons in the tank and set meter match to mid high and 2/3 tank on gauge.
7. Put last 6 gallons in the tank and set meter match to full and full tank on gauge
You don’t need my box to do this. My box is helpful if you don’t want to mess with all the gas and your sender is already in.
Others have done this and may have other processes.
