Range Rover P38
BMW DIESEL
9
DESCRIPTION AND OPERATION
Fuel injection pump (FIP)
The FIP is of the vane-type and is chain driven from
the front end of the crankshaft. Fuel delivery from the
FIP to the injectors is regulated by the movement of a
control spool. Movement of the control spool
increases or decreases the fuel delivery rate to meet
engine operating requirements.
The FIP houses the following items that either send
signals to the ECM, or responds to signals sent from
the ECM:
Fuel quantity servo unit
Moves the control spool to regulate the amount of fuel
delivered to injectors.
Servo unit potentiometer
Used by the control unit to calculate the position of the
control spool.
Injection timing device
Regulates pump speed dependent on internal pump
pressure.
Fuel temperature sensor
Monitors fuel temperature.
Stop solenoid
Cuts fuel delivery to the injectors when de-energised.
These items have been previously described in this
section -
See Input devices or Output devices as
applicable.
1. Rotary potentiometer
2. Quantity control servo unit
3. Stop solenoid
4. Injection timing device solenoid valve
5. Control spool
6. Timing device plunger
7. Drive shaft
8. Fuel temperature sensor
