Cutlass Supreme V6-3100 3.1L MFI VIN M (1994)
Fuel Level Sending Unit: Description and Operation
Fuel Sender Assembly
Operation
Fuel level is sensed by the position of the float and float arm which operate the 90 ohm rheostat. As the float position changes, the amount of
current passing through the rheostat varies, thus changing the gage reading on the instrument panel.
Construction
The fuel sender assembly is attached to the top of the tank, and extends from the top of the tank to the sump. The fuel sender assembly consists of
the following major components: a fuel sender, fuel pump, fuel pump strainer, fuel pulse dampener and the roll-over valve.
A roll-over valve is pressed into the vapor tube of the fuel sender and is not serviced separately. The roll-over valve prevents fuel from entering
the engine compartment if the vehicle rolls over by shutting "OFF" the vapor pipe to the evaporative emission canister.