quality fuel can cause the control lever
to stick and the engine to rotate over
speed, causing set damage or even
serious personal injury. Poor-quality
fuel will also shorten the maintenance
period, increase the maintenance cost
and reduce the normal service life of
the set. Replace the fuel filter regularly
1) Shut down the engine;
2) Cool the engine sufficiently to
avoid burns;
3) Prepare a vessel to collect leaked
fuel;
4) Remove the filter with special
tools;
5) Fill the new fuel filter with fuel;
6) Apply lubricating oil to the surface
of the filter seal ring before installation;
7) Install the filter with a special tool.
After the seal ring contacts the base,
tighten 3/4-1 turns to seal it;
8) Exhaust air;
a) Vent the air in the low-pressure
circuit, mainly the air in the filter, as
shown in Fig. 5-7.
Fig. 5-7 Air vent from low-pressure
circuit
Operation Manual of WEICHAI GENSET
fuel supply pump to remove air from
the fuel circuit until all air is removed.
Interrupt this operation and tighten
the bolt.
b) Vent the air from the high-
pressure circuit and fuel pump. The
operation is shown in Fig. 5-8.
Fig. 5-8 Air vent from high-pressure
circuit
Loosen the nut, drive the diesel engine
to run with the starter, drain the air
from the fuel pump and the high-
pressure fuel pipe until the high-
pressure fuel pipe continues to drain oil,
interrupt this operation, and tighten
the nut.
Caution! To avoid problems, it is
necessary to ensure that the battery is
in a good and appropriate working
environment when performing the
above operations.
c) Start the engine after venting air,
and remove all residual fuel first before
starting; if the engine can be started,
end the above process.
Fig. 5-9 Installation of fuel filter
Loosen the bolt and manually press the
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