F50 6
Engine fuel system (3)
The fuel filter system consists of two filters:
- Water separator filter (B).
- Main filter (D).
Filters are accessed inside vehicle’s right side hood (A).
Prefilter – draining of water
Drain the collecting vessel at regular intervals, or in
response to an error message from the engine control
unit.
- Drain valve (C) under the prefilter, loosen the drain
valve and collect, then close the valve again.
Changing the prefilter:
- Loosen drain valve (C) and collect until clean fuel
run out, then close the valve (C) again.
- Pull off the water sensor connector (D).
- Loosen the filter cartridge (B) using a filter wrench
or filter strap and unscrew.
- Clean sealing surface of filter bracket.
- Apply light coating of oil to the gasket in filter
cartridge and place them under the bracket, tighten
by hand.
- Reconnect the water sensor connector (D).
Bleeding the pre-filter:
- Release the manual fuel pump's (E) bayonet lock
by pressing and simultaneously turning
counter-clockwise.
- The pump plunger is now pressed out via the
spring.
- Pump until a very high resistance is perceptible and
pumping can only be carried out very slowly.
- Now continue pumping a few more times. (The
return line must be filled).
- Start the engine and operate for approx. 5 minutes
at idle speed or low load.
- Check the prefilter for leaks whilst doing this.
- Lock the manual fuel pump's (E) bayonet lock by
pressing and simultaneously turning clockwise.
Main filter is accessed inside vehicle’s service flap (F).
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