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You need to check the ground from the fuel sender to the chassis. The sending unit reads "full" at ground. It is 250 Ohms empty and 20 ohms when full. Ground the sender to the negative on the battery and the guage should read "full".
Likely a bad sending unit, but check the ground first. The rheostat winding gets fouled from the ethanol fuel so they "short" in one spot and thus it reads correctly until it hits a bad spot and then grounds to read full.
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