Bonneville V6-3.8L VIN K (1996)
Fuel Tank Unit: Description and Operation
The 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 fuel sender assembly consists of the following major components: a fuel sender, a fuel pump, a fuel pump strainer, a fuel pulse dampener, and
a roll-over valve.
The fuel sender consists of the float, the wire float arm, rheostat and the roll-over valve. The fuel level is sensed by the position of the float and
float arm, which perate 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.
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 engine compartment if the vehicle rolls over by shutting "Off" the VAP pipe to the evaporative emission canister.
LEGEND
1. Fuel Sender Assembly
2. Fuel Level Sensor Assembly
3. Filter
4. Fuel Pump
