![]() The fuel float contacts run on a potentiometer, or variable resistor, whose resistance changes depending on float level, effecting a change in output voltage. Input voltage, typically from the ignition circuit, is modified by the fuel sender. The sending unit is usually part of the Fuel Pump Module: a combination of parts that includes the fuel pump, fuel strainer, fuel filter, and fuel float. A fault in one or more of these parts will lead to gas gauge failure. The gas gauge system can be broken down into three basic parts: gauge, sender, and circuit. This cutaway fuel tank shows where the fuel sending unit is located.
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