Fuel Level Sensor: Description and Operation

The fuel level input comes across the CCD bus from the body control module. this input is used for the Fuel System and Misfire Monitors.

If the fuel level is below approximately 1/16th of a tank the Fuel System and Misfire monitors will be disabled.


The level sensor is attached to the side of the fuel pump module. The level sensor consists of a float, an arm, and a variable resistor. As the fuel level increases, the float and arm move up. This decreases the sending unit resistance, causing the fuel gauge on the instrument panel to read full.