The petrol gauge is a voltmeter. Therefore check the continuity of the wire from the sender unit first .Next if this is fine take the sender unit out unplug then check it is not jammed .Next put an ohm meter across the two terminals you should see a change on the readings as you move the float. Do you have 12v at positive to earth from the live wire ? if not check fuse and trace power..Last thing then (and this is the most difficult) get the gauge out and put 6v on the positive terminal and the other to earth. This should move the meter to around half .
This should locate the fault ,bet it is the sender unit in the tank.
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