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High pressure fuel pump (801), E39

High pressure fuel pump (801), E39

Location

High pressure fuel pump (801), E39

Located on LH side of engine bay near the fuel rail.

Main task

Control the high pressure fuel pump for supplying fuel from the pump in the fuel tank to the fuel rail, which then distributes fuel to the injectors.

Type

High pressure fuel pump (801) comprises a controlled mechanical single cylinder pump, driven by a cam with three lifters on the camshaft.

An integrated magnetic actuator controls the high-pressure pump inlet valve and thereby regulates the high-pressure fuel to the fuel rail.

At rest, the pump's inlet valve is held open with a spring. On activation, the magnetic actuator provides current and modulates the driving current of the ECM control module, E39 (590), so that the fuel pressure of each pump stroke is the desired.


Connection

801 pin no. Signal type Description
1 Inspection Connected to ECM pin 32(C).
2 Power supply Connected to ECM pin 16(C).



The fuel pump is supplied with power from the ECM control module, E39 (590), pin 16(C) and controlled with pulse width modulation (PWM) on its pin 32(C).