MAINTENANCE MANUAL OF GW4D20/GW4D20B TURBOCHARGED DIESEL ENGINES
42
Great Wall Baoding Internal Combustion Engine
Manufacturing Company Limited
Fig. 2-8-14 Integral fuel filter
(for matching with Delphi electronic fuel
injection system)
Fig. 2-8-15 Rotary fuel filter
(for Bosch electronic fuel injection system)
Figure 2-8-16 Water level alarm lamp of
fuel-water separator
The fuel filter is mounted on the low pressure fuel circuit.
The diesel enters the filter and the mechanical impurities
are eliminated by the filter core. The filtered diesel enters
the fuel delivery pump of high pressure fuel pump via the
fuel outlet pipe.
The GW4D20
／
GW4D20B turbocharged diesel engines
adopt integral fuel filters (see 2-8-14) and rotary fuel
filters ( see Fig. 2-8-15) respectively, these filters are
used for DELPHI and BOSCH electric fuel injection
systems respectively. Normally, the fuel filter which is
used for the DELPHI electronic fuel injection system
should be replaced after the engine runs for 500 h or the
vehicle travels 20000 ~ 25000 km, while the filter used
for the BOSCH electronic fuel injection system should be
replaced after the engine runs for 200 h or the vehicle
travels 8000 ~ 10000 km.
If poor quality diesel is used in the diesel engine or fuel is
contaminated by impurities, it is recommended that the
time to replace the filter core should be advanced,
because the filter will be blocked soon.
After the integral fuel filter has been replaced, press the
hand fuel pump mounted on the chassis to remove the
air in the fuel circuit.
After the rotary fuel filter has been replaced, press the
manual fuel delivery pump to remove the air in the fuel
circuit.
Caution:
(1) The fuel filter is disposable and is not allowed to be
reused.
(2) The fuel filter should be replaced regularly in
accordance
with
the
technical
maintenance
requirements.
4.2 Drain of Fuel Supply System
Take the diesel engine for vehicle as an example.
When the water level in the fuel-water separator reaches
the hazard level, the alarm lamp of fuel water separator
will light up (on the instrument panel, as shown in Fig.
2-8-16).
Attention:
When the diesel engine is running, the
lighting of the water level alarm lamp means that the
water in the fuel-water separator needs to be drained
out.
Method to drain the fuel filter:
(1) Park the vehicle in a safe and flat location.
(2) Open the engine hood, place the container (volume:
Cleaning of the air
cleaner filter core
Fuel outlet
Fuel return
port
Fuel inlet
Drain screw plug
Water leakage
sensor
Hand
fuel
pump
Fuel return
pipe
connector
Fuel inlet pipe
connector
Filter core of
filter cartridge
Electric
connector
Drain plug
