Fuel Pump Relay: Service and Repair

Replacing Fuel Pump Relay
E39 M5

Interrogate fault memory of DME control unit.
Switch off ignition.







Fold down right side trim in luggage compartment.







Detach fuel pump relay (1).
After removal of fuel pump relay and during engine starting sequence:
- the fuel pump no longer operates,
- the engine does not start.


NOTE:
Interrogate fault memory of DME control unit.
Check stored fault messages.
Rectify faults.
Now clear the fault memory.




Replacing Fuel Pump Relay
E52 Z8


Interrogate fault memory of DME control unit.
Switch off ignition.

Remove storage compartment at rear right.







Detach fuel pump relay (1).
After removal of fuel pump relay and during engine starting sequence:
- the fuel pump no longer starts up,
- the engine does not start.


NOTE:
Interrogate fault memory of DME control unit.
Check stored fault messages.
Rectify faults.
Then clear fault memory.