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AB Volvo Penta / Diesel Engine TAMD71B
9 Technical description
Fuel system
The fuel is drawn up by the feed pump from the fuel tank through the pre-filter(s) and is forced through
the fine filters to the injection pump. Excess fuel escapes via the overflow valve back to the tank. This
valve is located on the injection pump. This means that the return fuel flushes through (cools) the in-
jection pump’s fuel chamber. This evens out fuel temperature so it is is the same for all the cylinders
and prevents gas bubbles forming in the fuel line.
The injection pump then forces the fuel under high pressure to the injectors, which atomize the fuel
when it is sprayed into the engine’s combustion chambers.
Return fuel from the injectors returns to the tank via the overflow valve.
Fig. 9.1 Fuel system
1. Fine fuel filters
2. Venting screw
3. Pressure line from intake
manifold (charging pressure)
4. Injection pump
5. Pressure pipe
6. Injector
7. Fuel return pipe
8. Pressure equalizer
9. Centrifugal governor
10. Overflow valve
11. Return pipe, lubricating oil
12. Return line to fuel tank
13. Fuel line, intake
14. Feed pump
15. Hand pump
16. Engine oil line, inlet
Fig. 9.2 Solenoid valve (fuel shut-off valve) for stopping engine
A. Solenoid
T. Inlet from fuel tank (Tank)
P. Outlet to feed pump (Pump)
F. Inlet from fuel finefilters (Filters)
I. Outlet to injection pump (Injection pump)
2345 6
1
7
8
13 12 10 9
11
15 14
16
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