Low Pressure Fuel Pump Assembly
| ITEM | DESCRIPTION |
|---|---|
| 1 | Flange retaining ring |
| 2 | O-ring seal |
| 3 | Electrical connector - Fuel level sensors |
| 4 | Electrical connector - LP fuel pump |
| 5 | FFBH supply line connection (if equipped) |
| 6 | Fuel inlet filter |
| 7 | Float - Fuel level sensor 'A' |
| 8 | Swirl pot |
| 9 | Fuel level sensor 'A' |
| 10 | Suction pipe |
| 11 | Fuel vapor pipe connection (all except North American Specification (NAS) and China market vehicles) |
| 12 | Fuel supply line connection |
The LP fuel pump assembly is located in the right side of the fuel tank. The LP fuel pump assembly flange is sealed to the tank with an O-ring seal and secured with a retaining ring.
The top flange of the LP fuel pump assembly provides the internal and external interface for the tank electrical and fuel connections. The flange is formed with fuel level and LP fuel pump external electrical connectors. That are connected to the 2 fuel level sensors, and the in-tank LP fuel pump.
The lower part of the LP fuel pump assembly forms the fuel swirl pot, and provides the location for the in-tank LP fuel pump and the 2 jet pumps. The swirl pot provides a constant reservoir of fuel for the LP fuel pump to supply the HP fuel pump.
The fuel filter is installed on the bottom of the LP fuel pump assembly. The LP fuel pump assembly collects fuel from the right of the fuel tank through the fuel filter. The LP fuel pump assembly collects fuel from the left of the fuel tank through the suction pipe. The LP fuel pump assembly makes sure that sufficient fuel is available in the swirl pot for the engine depending on the demands. The FPDM controls the LP fuel pump assembly with a Low Voltage (3 Phase).
For cold climate market vehicles that feature a FFBH and an auxiliary FFBH fuel pump is available. The LP fuel pump assembly has an additional 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 installed with a sealed suction tube which draws fuel from the swirl pot. An additional fuel line connects the FFBH fuel pump to the FFBH fuel inlet.