DAF CF65, CF75, CF85 Series . Manual — part 411
©
200416
5-1
Fuel system, XE/PE engine
DIAGNOSTICS
ΧΦ65/75/85 series
4
1
5. FUEL SYSTEM, XE/PE ENGINE
5.1 INTRODUCTION
If there is a fault in the system, it is usually
detected by the electronic unit in the form of a
fault code. This fault code can be read out using
DAVIE. The fault-finding table contains possible
causes of symptoms not detected by the
electronic unit.
DIAGNOSTICS
5-2
©
200416
Fuel system, XE/PE engine
1
ΧΦ65/75/85 series
4
5.2 FAULT-FINDING TABLE
SYMPTOM: ENGINE CAN BE STARTED, BUT DOES NOT RUN
Possible cause
Remedy
Poor fuel quality
Drain fuel, flush fuel system, replace the fuel filters
and fill fuel tank with fuel
Air in fuel system
Check for drawing in of air:
-
via the suction pipe
-
via the seal of the fuel lift pump
Fuel fine filter/coarse filter clogged
Replace fuel fine filter and clean the system
No fuel supply/fuel lift pump defective; no delivery
Check:
-
the fuel level
-
the pipes for blockage and leaks
-
the fuel lift pump
-
the gallery pressure
Pressure relief valve on pump housing does not
shut off
Check the gallery pressure
SYMPTOM: ENGINE STALLS AND RUNS AGAIN AFTER RE-STARTING
Possible cause
Remedy
Air in fuel system
Check for drawing in of air:
-
via the suction pipe
-
via the seal of the fuel lift pump
Pressure relief valve on pump housing does not
shut off
Check the gallery pressure
SYMPTOM: ENGINE STARTS POORLY
Possible cause
Remedy
Poor fuel quality
Drain fuel, flush fuel system, replace the fuel filters
and fill fuel tank with fuel
Air in fuel system
Check for drawing in of air:
-
via the suction pipe
-
via the seal of the fuel lift pump
Fuel fine filter/coarse filter clogged
Replace fuel fine filter and clean the system
Mechanical defect or clogging in pump units
Replace the pump units
Injectors defective
Check the injectors
Pressure relief valve on pump housing does not
shut off
Check the gallery pressure
Fuel lift pump delivery too low
Check:
-
the fuel lift pump and replace if necessary
-
the gallery pressure
©
200416
5-3
Fuel system, XE/PE engine
DIAGNOSTICS
ΧΦ65/75/85 series
4
1
SYMPTOM: ENGINE RUNS AT (INCREASED) IDLING SPEED AND DOES NOT RESPOND TO AC-
CELERATOR PEDAL
Possible cause
Remedy
Mechanical defect of accelerator pedal sensor
Check:
-
mechanical connection of sensor/accelerator
pedal
-
accelerator pedal sensor
SYMPTOM: DIESEL KNOCK DURING ACCELERATION
Possible cause
Remedy
Poor fuel quality
Drain fuel, flush fuel system, replace the fuel filters
and fill fuel tank with fuel
Air in fuel system
Check for drawing in of air:
-
via the suction pipe
-
via the seal of the fuel lift pump
Injector defective
Check the injectors
SYMPTOM: IRREGULAR RUNNING OF ENGINE
Possible cause
Remedy
Poor fuel quality
Drain fuel, flush fuel system, replace the fuel filters
and fill fuel tank with fuel
Air in fuel system
Check for drawing in of air:
-
via the suction pipe
-
via the seal of the fuel lift pump
Fuel fine filter/coarse filter clogged
Replace fuel fine filter and clean the system
Mechanical defect or clogging in pump units
Replace the pump units
Injector defective
Check the injectors
Fuel lift pump delivery too low
Check:
-
the fuel lift pump and replace if necessary
-
the gallery pressure
Pressure relief valve on pump housing does not
shut off
Check the gallery pressure
SYMPTOM: REDUCED POWER AT ALL ENGINE SPEEDS
Possible cause
Remedy
Poor fuel quality
Drain fuel, flush fuel system, replace the fuel filters
and fill fuel tank with fuel
Fuel fine filter/coarse filter clogged
Replace fuel fine filter and clean the system
Mechanical defect or clogging in pump units
Replace the pump units
Mechanical defect of accelerator pedal sensor
Check:
-
mechanical connection of sensor/accelerator
pedal
-
accelerator pedal sensor
DIAGNOSTICS
5-4
©
200416
Fuel system, XE/PE engine
1
ΧΦ65/75/85 series
4
Mechanical defect or clogging in pump units
Replace the pump units
Injector defective
Check the injectors
Pressure relief valve on pump housing does not
shut off
Check the gallery pressure
Fuel lift pump delivery too low
Check:
-
the fuel lift pump and replace if necessary
-
the gallery pressure
SYMPTOM: REDUCED POWER AT ALL ENGINE SPEEDS
Possible cause
Remedy
SYMPTOM: REDUCED POWER ABOVE A CERTAIN ENGINE SPEED
Possible cause
Remedy
Fuel fine filter/coarse filter partially clogged
Replace fuel fine filter and clean the system
Mechanical defect or clogging in pump units
Replace the pump units
Air leak in inlet system
Pressure-test the air inlet system
Pressure relief valve on pump housing does not
shut off
Check the gallery pressure
Fuel lift pump delivery too low
Check:
-
the fuel lift pump and replace if necessary
-
the gallery pressure
SYMPTOM: WHITE/BLUE SMOKE IS EMITTED
Possible cause
Remedy
Poor fuel quality
Drain fuel, flush fuel system, replace the fuel filters
and fill fuel tank with fuel
Air in fuel system
Check for drawing in of air:
-
via the suction pipe
-
via the seal of the fuel lift pump
Fuel fine filter/coarse filter clogged
Replace fuel fine filter and clean the system
Mechanical defect or clogging in pump units
Replace the pump units
Injector defective
Check the injectors
Fuel lift pump delivery too low
Check:
-
the fuel lift pump and replace if necessary
-
the gallery pressure
SYMPTOM: BLACK SMOKE IS EMITTED
Possible cause
Remedy
Injector defective
Check the injectors
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