English-31
DESIGN AND FUNCTION
Fuel system
The fuel system with injection pump has
excellent operational reliability as long as the
fuel is kept clean. If contaminated fuel is filled
or enters the system in the incorrect manner,
the risk of malfunction or wear/damage to the
injection pump increases. Contaminants can
be dust particles or in the form of liquid, such
as water or petrol.
The fuel in the tank is drawn up by the feed
pump and pushed through the fuel filter to the
injection pump’s fuel chamber. The feed
pump supplies a greater quantity of fuel than
the injection pump requires. Consequently,
there is an overflow pipe on the injection
pump, which leads off surplus fuel yet main-
tains the feed pressure in the fuel chamber.
The excess is routed away via the injector’s
leak oil line back to the tank.
There is a hand pump on the fuel filter, which
is used to bleed the fuel system.
8043-186
Fuel system, components
1. Fuel tank
2. Feed pump
3. Fuel filter
4. Hand pump
5. Injection pump
6. Injectors
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