Sounds like the fuel sensor is wired backwards. Never heard of such a problem. Here is a check to make on the fuel sensor.
Fuel Level Sensor Inspection •
Unplug the sensor lead connector.
Using a meter, measure the resistance across the terminals in the fuel level sensor lead connector.
If the tester readings are not as specified below may have to replace the sensor.
Fuel Level Sensor Resistance
Standard: Full position: 4 ∼ 10 Ω
Empty position 90 ∼ 100 Ω
There is float that moves up and down on the other side of the sensor. To get to it you would need to remove the tank and the sensor. The resistance should change as the float moves up and down. You can empty the tank to see if the resistance changes. I would first see what the measurement is at the connector.
If the ohms are correct and changes based on the fuel in the tank, I wonder if the wires are reversed? What are the odds?
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