Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
73
VI. Common malfunctions and troubleshooting for low pressure fuel line
No. Malfunction Troubleshooting Remarks
1 Weak pumping of
fuel
Retighten the connectors (temperature
sensor, plug, and pile connector), in
order to prevent the pumping failure
due to ingress of air. If ineffective,
replace the manual pump.
The tightening torque for connectors is
30-35N.m. Higher torque will lead to
thread failure.
2 Fuel leakage of air
bleeding screw
Check the screw hole of manual pump
for presence of thread failure. If yes,
replace the transitional thread insert
and air bleeding screw and washer.
The tightening torque is 7~9N.m. Higher
torque will lead to thread failure. While
assembling the transitional thread insert,
add an appropriate amount of thread sealant
onto the thread. Prevent the ingress of
sealant into the manual pump.
3 Fuel leakage of
manual pump
Replace the manual pump The knocking or improper use will lead to
fuel leakage of manual pump
4 Slow acceleration
and difficult start
due to difficult
fuel supply
The filter is blocked. Replace the filter.
If the malfunction still occurs after
replacement of fuel filter, check other
engine parts.
The blockage of fuel filter will increase the
pressure difference.
5 Failure for timely
water drainage
Make sure to drain the water when the
water level sensor indicator lamp lights
up.
If the water is not drained, the water
content in fuel will increase to impair the
engine performance.
6 Light-up failure of
water level sensor
indicator lamp at
engine start
1. Water level sensor is damaged.
2. Indicator lamp is damaged.
3. Circuit malfunction
7 Working failure of
heater
1. The heater is damaged.
2. Circuit malfunction
3. Low battery current
4. The heater is punctured due to high
current
8 Working failure of
temperature
sensor
Damage o temperature sensor
Circuit malfunction
To Next Page
Loading...