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Maintenance. Fuel system
Fuel system
Only use the grades of fuel recommended in the fuel specification, see Technical Data. Always observe the great-
est cleanliness during re-fuelling and work on the fuel system.
All work on the unit injectors of the engine must be carried out by an authorised workshop.
WARNING! Fire hazard. Work on the fuel system must be carried out when the engine is cold. Fuel spills on
hot surfaces or electrical components can cause fires. Store fuel-soaked rags and other flammable material
in fireproof conditions.
WARNING! Hot fuel can cause burns.
Fuel system venting
The fuel system must be vented, e.g. after changing
fuel filter, if the fuel tank has been run dry and after
long stops.
Single filter and Switchable filters
Stationary engine:
1. Put a suitable vessel underneath the fuel filter.
2. Remove the protective cap from the venting nipple
(1) on the filter bracket. Connect a transparent
plastic hose to the nipple and lower this into the
vessel.
3. Open the venting nipple and pump up fuel with the
hand pump (2) until air-free fuel flows out. Tighten
the venting nipple while fuel is flowing out. Repeat
with the second switchable filter.
4. Remove the hose and put the protective cap back
on the venting nipple.
5. If the tank has been run dry or if the engine, for
some reason, has been emptied of fuel, open the
venting nipple (3) at the front of the engine block
and vent in the same way.
6. Run the engine at idling speed for a couple of
minutes to allow any remaining air out of the sys-
tem. Then close the vent (3) on the engine and
make sure there are no leaks.
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