DAF CF85 Series Service Manual

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
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DAF CF85 Series Specifications

General

Brand	DAF
Model	CF85 Series
Category	Trucks
Language	English