fuel gauge on 1993 Ford Explorer

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My fuel gauge has stopped working. Is it due to the float or is there a re-set switch? The fuel pump is working just fine, so is the float attached to the pump?
(1) Answer
today's gas contains ethanol which for the 93 was corrosive to some of the parts in the tank, the fuel gauge sensor in the tank of that year used aluminum nicrom wire to measure the resistance so the gauge could display the fuel level, newer trucks removed the aluminum in the sensor to keep the corrosive ethanol from being a problem, you could either just change the sensor in the tank or use a volt/ohm meter to check the sensor to see if it working, you will get a low reading at one end of the float position and have a smooth increase to the other end of the position if you don't get a reading on the ohms or it jumps around the sensor is bad.