Fuel Tank Unit: Description and Operation

The fuel sensor is attached to the modular fuel sender. The resistance of the fuel sensor changes with the fuel level by means of a rheostat. As the position of the float varies with the fuel level, the rheostat produces a variable resistance. The fuel gauge converts this variable resistance into the fuel level reading, then the reading is sent to the Instrument Panel Cluster (IPC) and displayed on the fuel gage. It is also sent to the PCM over UART serial data, and used for evaporative emissions system diagnosis.