The fuel level sensor (fuel gauge sending unit) 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 and the float and arm moves up, a decrease results in the sending unit resistance. This causes the fuel gauge on the instrument panel to read FULL. The Fuel Level Sensor (fuel gauge sending unit) sends a signal to the BCM. In turn, the BCM provides the signal over the PCI bus circuit to the PCM to indicate fuel level.
The purpose of this feature is to prevent a false setting of misfire and fuel system monitor trouble codes, if the fuel level is less than 15% of its rated capacity. It is also used to send a signal for fuel gauge operation via the PCI bus circuits.
The fuel gauge level sending unit is attached to the fuel pump module. The fuel level sensor (fuel gauge sending unit) sends a signal to the PCM to indicate fuel level.