DAF CF85 Series Service Manual

©
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
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DAF CF85 Series Specifications

General

Brand	DAF
Model	CF85 Series
Category	Trucks
Language	English