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Manual
F 240
4. General
5. Description of
engine parts
Fuel feed pump
(1.1)
Fine fuel filter
(1.2)
High pressure
fuel pumps
(1.3)
Ver. 01
FUEL SYSTEM
5A
5A
INTRODUCTION
INTRODUCTION
Good performance of a diesel engine greatly depends on the correct timing, correct
quantity and good atomisation of the fuel injection.
This paragraph is a general description of the function of engine parts in the fuel
system.
The main parts of the fuel system are given in the general diagram (paragraph 5F).
These main parts have a number which corresponds to the number in the diagram.
This number is placed between brackets in the description below.
The fuel system is standard equipped with an engine driven fuel feed pump, which is
fed from the day tank (starting tank), placed approximately 2m above the top of the
engine.
The fuel flows via the fine fuel filter and main fuel feed line to the high pressure fuel
pumps. The high pressure fuel pumps supply the fuel to the nozzles.
For a good filling of the high pressure fuel pump the capacity of the fuel feed pump is
approximately 4x higher than the full load consumption of the engine.
The surplus fuel flows from the high pressure fuel pumps into the return line to the day
tanks (starting tank).
The amount of heat collected by the fuel during passage through the high pressure fuel
pump must be dissipated by the return piping and the tank.
The duplex fuel filter serves to remove impurities from the fuel, so that they cannot
enter the fuel system, and inflict damage on the high pressure fuel pumps or the
nozzles. The fuel filter consists of two compartments, each fitted with a filter element
which can be removed (also with the engine in operation).
This fine fuel filter is the last protection of the fuel injection equipment.
The high pressure fuel pump pumps the fuel via the high pressure fuel line and the fuel
injector into the cylinder. The high pressure fuel pumps are equipped with an oil barrier
system.
All fuel pumps have been calibrated accurately and provided with a sealed stop on the
fuel rack. The purpose of this stop is to limit the engine output. If this seal is broken
during the guarantee period, this may have as consequence, invalidation of the guar-
antee!
5 - - 1
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