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Maintenance: Fuel system
Switchable type fuel filters
Switchable fuel filters can be changed while running
as the flow of fuel can be cut off to one filter at a time.
WARNING! Working on or approaching a run-
ning engine is a safety hazard. Beware of rotat-
ing parts and hot surfaces.
1. Put the lever (2) in its right-hand end position.
2. Unscrew the left-hand fuel filter. Use a filter
wrench if necessary.
3. Screw on the filters by hand until they make con-
tact with the sealing surface. Then screw a further
half turn, not any more!
4. Open the left-hand bleed screw (1) on the filter
bracket. Put the lever in operating position
(straight up). Close the bleed screw when the fuel
running out is free from air.
5. Put the lever in its left-hand end position and
change the right-hand fuel filter in the same way.
Fuel pre-filter. Check
WARNING! Working on or approaching a run-
ning engine is a safety hazard. Beware of rotat-
ing parts and hot surfaces.
The fuel pre-filter/water separator are accessories
and available as single or dual models.
The dual filter is equipped with a pressure gauge (1)
indicating when it is time to change the filter insert.
The filter inserts must be changed according to the
maintenance schedule recommendations or ealier if
the pressure gauge indicates a vacuum of 6–10 in.
Hg at idling speed or 16–20 in. Hg at full engine
speed/load.
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