Fuel sending unit calibration

plymouth71 said

Not a trick question,I have tried bending the float arm,and tried bending the stop tabs.No matter what I do it always shows half a tank off.It could be I got a hold of a bad sender.I tested the gauge and it is good,checked wiring from gauge to tank,all good,it's been a pure headache.

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What I do is test them before installing in the tank. I hook it up to the connector at the tank and ground it. I have someone watch the gauge as I slowly run it through it's range. Start at the FULL position, stop at 3/4, then 1/2, then 1/4 and finally at EMPTY. Then I check by gauge position and note where the float arm is when the gauge reads FULL, 3/4,1/2,1/4 and finally EMPTY. It is amazing to see how bad some sending units are. It's putsy work, but beats installing it and finding out it's junk.