Fuel Pump Module
| ITEM | DESCRIPTION |
|---|---|
| 1 | Fuel return connection |
| 2 | Fuel supply connection |
| 3 | Fuel level sensor electrical connector |
| 4 | Fuel pump electrical connector |
| 5 | Fuel Fired Booster Heater (FFBH) supply connection |
| 6 | Fuel inlet filter |
| 7 | Fuel Fired Booster Heater (FFBH) suction tube and seal (if fitted) |
| 8 | Fuel level sensor float |
| 9 | Swirl pot |
| 10 | Active fuel level sensor - 'A' |
| 11 | Jet pump connection - left (passive) side of fuel tank |
| 12 | Locking ring and O-ring seal |
The fuel pump module is located in the right side of the tank. The fuel pump module flange is sealed to the tank with an O-ring and secured with a locking ring.
The top flange of the fuel pump module assembly provides the internal and external interface for the tank electrical and fuel connections. The flange is formed with fuel level and fuel pump external electrical connectors that are connected to the active and passive fuel level sensors, and the in-tank fuel pump.
The lower part of the fuel pump module forms the fuel swirl pot, and provides the location for the in-tank fuel pump and the two jet pumps. The swirl pot provides a constant reservoir of fuel for the LP fuel pump.
On vehicles without an auxiliary fuel pump - The swirl pot provides a constant reservoir of fuel for the Low Pressure (LP) fuel pump to supply the High Pressure (HP) fuel pump.
On vehicles with an auxiliary fuel pump - The swirl pot provides a constant reservoir of fuel for the LP fuel pump to supply the auxiliary fuel pump.
Fuel is supplied by the LP fuel pump in the fuel tank mounted fuel pump module to the High Pressure (HP) fuel pump mounted on the engine.
The Low Pressure (LP) fuel pump also supplies the fuel flow to power the two venturies. The rapid flow of fuel through the venturi nozzles creates a depression. This depression draws fuel across the fuel tank from the passive side of the fuel tank into the active side of the fuel tank.
The second venturi nozzle draws fuel from the active side of the fuel tank into the fuel pump module swirl pot. Surplus of fuel entering the swirl pot overflows into the active side of the fuel tank.
For cold climate market vehicles that feature a Fuel Fired Booster Heater (FFBH) and an auxiliary FFBH fuel pump, the fuel pump module has a separate pipe connection for a fuel supply line that connects to an auxiliary fuel pump mounted on the exterior right side of the fuel tank. This pipe connection is fitted with a sealed suction tube which draws fuel from the swirl pot. An additional fuel line connects the auxiliary fuel pump to the FFBH fuel inlet.