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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
The gauge should go to full when power is applied. Sensor is 15 ohms empty and 170 ohms full. So, unless the sensor is shorted (highly unlikely) the problem is the float full of gas. If you have a meter, measure the resistance. The sensor will be the two smaller wires in the connector.