Fuel gage maxes out to full when ignition on.

NWPT70

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I am having an issue that the gas gauge heads to max full once the ignition key is turned on. When the key is off the gauge goes back to empty. The gas tank is half full. Hmm?
 
Sounds like the wire to the sending unit is shorted to ground. Pull it off the connection at the sending unit, then see what it does with key on.
 
Sounds like the wire to the sending unit is shorted to ground. Pull it off the connection at the sending unit, then see what it does with key on.

Could also be a fused cluster regulator or a bad sending unit in the tank.
 
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