Century V6-3100 3.1L VIN M SFI (1998)
Fuel Tank Unit: Description and Operation
Fuel Sender Assembly
The modular fuel sender assembly is attached to the top of the fuel tank, and extends from the top of the fuel tank to the reservoir.
The modular fuel sender assembly (5) consists of the following major components: a fuel pump, a fuel sender strainer (3), a fuel pump strainer, a
roll-over valve (2), fuel level sensor (4), and a fuel tank pressure sensor.
The fuel sender consists of the float, the wire float arm, and, the rheostat. The rheostat is mounted on the fuel sender and located in series with the
voltage supply circuit from the fuel gage or body control module (BCM). As the position of the float varies with the fuel level, the rheostat produces a
variable resistance between the fuel gage or BCM and ground. The fuel gage converts this variable resistance into the fuel level reading display on the
instrument panel.
The roll-over valve is pressed into the EVAP pipe of the fuel sender and is not serviced separately. The roll-over valve prevents fuel from entering the
EVAP canister if the vehicle rolls over by shutting OFF the EVAP pipe to the evaporative emission canister.
