PRE-RELEASE
Fuel pump (689), E39
| Fuel pump (689), E39 |
| Location |
Fuel pump (689), E39
The pump unit is mounted inside the front edge of the fuel tank.
| Main task |
The unit pumps fuel in a returnless system through the fuel pipe to the high pressure fuel pump (801), E39, on the engine and measures the fuel quantity in the fuel tank.
| Type |
The fuel level sensor (46) comprises a potentiometer connected to a float mounted on an arm.
The electric fuel pump (323) is of the turbine type and feeds fuel to the fuel pipe. It also includes a non-return valve to maintain the fuel pressure in the fuel pipe.
| Connection |
| 689 pin no. | Signal type | Description |
| 1 | Power supply to fuel pump motor (323), E39. | Connected to fuel pump control module (697), E39, pin 5. |
| 4 | Ground to fuel pump motor (323), E39. | Connected to fuel pump control module (697), E39, pin 8. |
| 46 pin no. | Signal type | Description |
| 3 | Ground | Connected to ECM, control module, E39 (590), pin 26(A). |
| 2 | Signal | Connected to ECM, control module, E39 (590), pin 25(A). |
| 46LH pin no | Signal type | Description |
| 4 | Ground | Connected to ECM, control module, E39 (590), pin 26(A). |
| 3 | Signal | Connected to ECM, control module, E39 (590), pin 27(A). |
The electrical fuel pump (323), E39, is fed with pulse width modulation (PWM) from the fuel pump control module (697), E39, which receives the command from control module, SCM (587), E39.
Fuel level sensor (46), E39, is connected to ECM, control module, E39 (590).
On AWD models a secondary tank sensor is also used: fuel level sensor (46LH), E39, also this connected to ECM.
Diagram, fuel pump motor (323), E39
Fuel level sensor diagram (46 and 46LH), E39
