C 3500 Truck 2WD V8-6.6L DSL Turbo VIN 1 (2002)
Fuel Level Sensor: Description and Operation
The fuel level sensor consists of a float, a wire float arm, and a ceramic resistor card. The position of the float arm indicates the fuel level. The fuel level
sensor contains a variable resistor which changes resistance in correspondence with the amount of fuel in the fuel tank. The ECM sends the fuel level
information via the Class II circuit to the Instrument Panel (IP) cluster. This information is used for the IP fuel gage and the low fuel warning indicator,
if applicable. The ECM also monitors the fuel level input for various diagnostics.
