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BMW DIESEL 9 DESCRIPTION AND OPERATION Fuel injection pump (FIP) The FIP is of the vane-type and is chain driven from The FIP houses the following items that either send Fuel quantity servo unit Moves the control spool to regulate the amount of fuel Servo unit potentiometer Used by the control unit to calculate the position of the Injection timing device Regulates pump speed dependent on internal pump 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 See Input devices or Output devices as applicable. 1. Rotary potentiometer 5. Control spool |