Maintenance: Fuel system
51
Fuel filters. Change
Switchable fuel filters can be changed while running
as the flow of fuel can be cut off to one filter at a time.
NOTE! Leave the old filters to a destruction plant.
Switchable type fuel filters
WARNING! Working on or approaching a run-
ning engine is a safety hazard. Beware of rotat-
ing parts and hot surfaces.
1. Place a receptacle beneath the filters and carefully
clean the filter bracket.
2. Put the lever (2) in its right-hand end position.
3. Unscrew the left-hand fuel filter and discard it.
Use a filter wrench if necessary.
4. Screw on the new filter by hand until the gasket
make contact with the sealing surface. Then tight-
en a further half turn, not any more!
5. 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.
6. Put the lever in its left-hand end position and
change the right-hand fuel filter in the same way.
Fuel system. Bleeding
The fuel system must be bled e.g. after changing fuel
filter, if the fuel tank has been run dry and after long
stops. Refer to the next page for bleeding when re-
placing a switchable fuel filter during operation.
1. Place a receptacle under the fuel filter and open
the bleed screw (1) on the filter bracket.
2. Pump fuel using the hand pump (2) until the fuel
running out is free from air bubbles. Tighten the
bleed screw while fuel is running out.
3. Pump another 10–20 times with the bleed screw
closed to attain a good feed pressure.
4. Make sure there are no leaks.
No other bleeding is normally required but if the en-
gine will not start, the injection pump must be bled as
follows:
1. Detach the connection (3) and pump with the hand
pump until the fuel running out is free from air.
2. Tighten the conection while fuel is running out.
3. Pump another 10–20 times to attain a good feed
pressure.
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