K 1500 Yukon 4WD V8-5.3L VIN Z Flex Fuel (2003)
Fuel Gauge Sender: Description and Operation
Fuel Level Sensor
FUEL LEVEL SENSOR
The fuel level sensor consists of a float, a wire float arm, and a ceramic resistor cord. The position of the float arm indicates the fuel level. The fuel level
sensor contains a variable resistor, which changes resistance in correspondence to the amount of fuel in the fuel tank.
The powertrain control module (PCM) sends the fuel level information via the class 2 circuit to the instrument panel (I/P) cluster. This information is
used for the I/P fuel gage and the low fuel warning indicator, if applicable. The PCM also monitors the fuel level input for various diagnostics.
