My vote is a bad sensor. First thing to do is just check if the float is stuck, just try and move it around when the engine is cold.
The only bad part, the sensor is only like $20, but is on the bottom of the tank, so it is a bit of work to get to and change, as opposed to simply changing the whole tank out, which is usually around $100 part. I would judge it a bit on if the vehicle has the newer tank with the yellow arrow on the top, if not, I would for sure update it.
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