Fig. 6 Fuel system
1. High pressure fuel manifold 2. Pipe clamping plate 3.
Rubber
gasket 4. Injector fuel return pipe assembly
S.
In-
jection pump fuel inlet pipe assembly 6. Injector 7. Fuel filter assembly
8.
Governor 9. Stopping handle 10. Speed
adjusted handle 11. Fuel filter inlet pipe assembly 12. Fuel delivery pump inlet pipe assembly 13. Fuel delivery
pump 14. Injection pump IS. Injection
pump
fixed bolt 16. Advancer 17. Injection
pump
gear 18. Injection pump
gear qressing plate 19. Bolt
When
the
diesel engine is working fuel flows through fuel
tank,
inlet pipe,fuel delivery
pump into
the
fuel
filter,
after being filtered,it enters into
the
injection
pump,
then
be-
ing compressed
with
plunger mate
to
high pressure,through fuel cock and high pres-
sure fuel
pipe,
it
enters into injector. When the pressure is high enough to open the
needle valve
nate
of
the
injector,the fuel will be sprayed into combustion
ch~mber
in
the
form
of
atomization.
After
spraying,the pressure will gets
lower,
the
needle valve
returns
to
the
seat under
the
force
of
spring,the injecting hole
no
sprays again.
The extra fuel that
the
fuel delivery pump supplies more than
the
injection
pump
used,also
with
the
fuel
that
the injector needle valve mate leaks and
the
returning
fuel
of
the
fuel filter and
the
injection pump will
flows
back
to
the
fuel tank.
8.1
Fuel·delivery
pump
The purpose
of
the
fuel delivery
pump
is
to
keep
the
low
- pressure fuel pipe full
of
pressed fuel. In order
to
remain
the
pressure stable, the piston
of
the
fuel delivery
•
35
•
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