Fuel Gauge Issue

69conv said

My car has a grounding strap from the sender at the tank to the fuel line on the other side of the rubber hose at the tank. If it becomes corroded the sender malfunctions.

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I didn’t have a strap on the original but did have a copper wire going from the fuel line on the sender to an exhaust bracket. I have added another copper line from the same spot on the new pump/sender to another grounding location and no change. Tested the ground by grounding the signal wire to the copper line and the needle moved so that ground wire is good. Did the same to the ground location for the sending unit ground wire and same thing.

@Dana67Dart I drained the tank and pulled the sender, I see exactly what you mean about range and resistance. I pulled roughly eight gallons out and the gauge was reading empty. Hooking up the meter, at 40 ohms it’s empty, but has 8 gallons of fuel. This sender is terrible. I also do believe I have an issue with the factory wire, connector or circuit board. Based on testing today.