Cutlass Ciera Cruiser V6-3100 3.1L MFI VIN M (1994)
The fuel sender consists of the float, wire float arm, rheostat and the roll-over valve. 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
gauge reading on the instrument panel.
Roll-Over Valve
The roll-over valve is pressed into the evaporative Emissions (EVAP) pipe 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 EVAP pipe to the evaporative emission
canister.
FUEL PUMP
A high pressure turbine pump is mounted to the fuel sender inside the fuel tank. The fuel is pumped to the engine at a specified flow and pressure
through the fuel pump. Excess fuel is returned to the fuel tank by a return pipe. The fuel pump delivers a constant flow of fuel to the engine even
during low fuel conditions and aggressive vehicle maneuvers.
The electric fuel pump operation is controlled by the Powertrain Control Module (PCM) through a fuel pump relay.
FUEL PUMP STRAINER
A woven plastic fuel pump strainer is attached to the lower end of the fuel pump in the fuel tank. The functions of the fuel pump strainer are to
filter contaminants and to wick fuel.
The life of the fuel pump strainer is generally considered to be that of the fuel pump. The fuel pump strainer is self-cleaning and normally requires
no maintenance. Fuel stoppage at this point indicates that the fuel tank contains an abnormal amount of sediment or water, in which case the tank
should be thoroughly cleaned. Refer to Fuel System / Service and Repair / Fuel System Cleaning. If the fuel pump strainer is plugged, replace it
with a new one. See: Service and Repair/Fuel System Cleaning Procedures
