DAF LF45, LF55 Series. Manual - part 296

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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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