DCE80-100E
Technical Handbook
Engine TAD720VE
Description
24
P.Group 30
TDCE01
04GB
Fuel system
The fuel circulates in two circuits - the high-pressure circuit and
the low-pressure circuit. When the engine is started, the feed
pump draws fuel from the tank and delivers it at relatively low
pressure through fine filters up to the injection pumps. These then
deliver fuel at high pressure to the injectors which supply the fuel
in atomised form to the engine combustion chambers.
Excess fuel which is circulated in the low-pressure system is also
cleaned in the fine filters and is returned through a spill valve
back to the tank.
The fuel system includes the following components:
Fuel tank - a separate unit located on the left-hand side of the
truck. The fuel volume in the tank can be read on a gauge on the
instrument panel.
Feed pump - of piston type, supplies fuel at a certain pressure
and flow rate to the injection pumps.
Spill valve - which restricts the fuel feed pressure and provides
continuous venting of the fuel system. The excessive fuel is flow-
ing through the injection pumps before it is fed through the return
line to the fuel cooler and thereafter to the fuel tank.
Fuel cooler
The fuel cooler is positioned on top of the charge air cooler. Its
purpose is to lower the return fuel temperature and thereby also
the temperature in the fuel tank. A lower fuel temperature gives
higher combustion efficiency.
Bränslesystem, principschema
1. Fuel tank
2. Fuel hose to fuel pump
3. Feed pump
4. Fuel hose to fuel filter
5. Fuel filter
6. Fuel hose to fuel channel
7. Injection pumps, 6 pcs
8. Fuel line to injectors
9. Injector
10. Leak oil line
11. Over flow valve, return fuel
12. Return to fuel tank
13. Fuel line
14. Pre filter with water separator
15. Manual feed pump
16. Fuel cooler, air/fuel
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