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Some fuel sending units are wire wound resistors across which there is a
slider controlled by a float in the tank. The resistance wire is close wound
around an insulator. This is the definition of a coil. A coil without a
capacitor is a very broad band receiver.
Try putting a small capacitor across the sender. You now have a tuned
circuit. If there is any change you are on the road to solution. Experiment
with capacitances. If there's no change just cuss me out.
I trust the problem occurs on the ground, and with a handheld comm and easy
access to the sending unit connection the cussing should,t be too bad.

Bob Barker

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