DAF CF65, CF75, CF85 Series . Manual - part 426

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9.

Install the cable harness (3) to the fuel rail (2) 
and secure it using cable ties.

10. Fit the connectors of the injectors (1) in the 

valve sleeve.

11. If it has been removed, fit the plug of the inlet 

air temperature/boost pressure sensor to the 
sensor.

12. Fit the connector of the fuel rail pressure 

sensor.

13. Start the engine and check the fuel system 

for leaks.

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5.5 REMOVAL AND INSTALLATION, FUEL RAIL PRESSURE-LIMITING VALVE

When removing the pressure-
limiting valve, fuel will escape. 
Collect the fuel and avoid the risk of 
fire. 

Dirt in the fuel system can lead to 
significant damage to parts of the 
system. Prevent this by cleaning the 
parts before disassembly and then 
sealing all open connections.

Removing fuel rail pressure-limiting valve
1.

Clean the pressure-limiting valve (2) and the 
surrounding area.

2.

Remove the fuel return pipe (3) from the 
pressure-limiting valve (2).

3.

Remove the pressure-limiting valve (2) from 
the fuel rail (1).

Installing fuel rail pressure-limiting valve
1.

Check the sealing surface and the screw 
thread of the pressure-limiting valve and the 
fuel rail.

2.

Install the pressure-limiting valve in the fuel 
rail and tighten the valve to the specified 
torque. See "Technical data".

3.

Fit the fuel return pipe on the pressure-
limiting valve.

4.

Start the engine and check the pressure-
limiting valve for leaks.

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5.6 REMOVAL AND INSTALLATION, HIGH-PRESSURE PUMP

When removing the high-pressure 
pump, fuel will escape. Collect the 
fuel and avoid the risk of fire. 

Dirt in the fuel system can lead to 
significant damage to parts of the 
system. Prevent this by cleaning the 
parts before disassembly and then 
sealing all open connections.

Removing the high-pressure pump
1.

Clean the high-pressure pump and that part 
of the engine around it thoroughly with, for 
example, a steam cleaner. Cover the places 
at which leaks have been detected to 
prevent dirt getting into the fuel system.

2.

Disconnect the fuel pipes from the high-
pressure pump. Loosen the return pipe only 
on the high-pressure pump.

3.

If fitted, uncouple the connector of the fuel 
temperature sensor (1) on the fuel fine filter 
head and the connector of the fuel pump 
control solenoid valve (2).

4.

Remove the fuel fine filter together with the 
filter head.

5.

Loosen both unions from the high-pressure 
pipe to the fuel rail as well as the pipe 
clamps. Remove the high-pressure pipe. 
Plug all openings.

6.

Remove the three high-pressure pump 
attachment nuts and then the high-pressure 
pump.

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Note:
The high-pressure pump is fitted on the gear side 
with an adapter ring (1) and an O-ring (2) in the 
timing gear case. If the removal of the high-
pressure pump is particularly difficult, it may be 
necessary to press the adapter ring (1) carefully 
out of the timing gear case using a small pry bar.

Installing the high-pressure pump
1.

Clean the high-pressure pump. Make sure 
that no dirt or cleaner can get into the high-
pressure pump ducts.

2.

Check the high-pressure pump and the drive 
gear (externally) for wear and damage.

3.

Fit a new O-ring (2) on the adapter ring (1) 
and apply a thin layer of engine oil to the O-
ring.

4.

Fit the high-pressure pump and press it into 
the timing gear case by means of the 
attachment nuts.

5.

Tighten the attachment nuts to the specified 
torque. See "Technical data".

6.

Fit the filter head and the fuel fine filter.

7.

Fit the high-pressure pump to the fuel rail 
and tighten the unions. See "Technical data" 
for the specified tightening torques.

8.

Tighten the pipe clamps.

9.

If fitted, connect the connector of the fuel 
temperature sensor (1) on the fuel fine filter 
head and the connector of the fuel pump 
control solenoid valve (2).

10. Fit the fuel pipes to the high-pressure pump.

11. Bleed the fuel system. See "Inspection and 

adjustment".

12. Start the engine and check the fuel system 

for leaks.

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