DAF LF45, LF55 Series. Manual — part 319

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Removal and installation

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5.4 REMOVAL AND INSTALLATION, FUEL RAIL

When removing the fuel rail, 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 fuel rail
1.

Remove the connector from the fuel rail

pressure sensor.

2.

If necessary, remove the plug of the inlet air

temperature/boost pressure sensor by

loosening the connector.

3.

Remove the connectors of the injectors (1)

from the valve sleeve.

4.

Disconnect the cable harness (3) on the fuel

rail (2) and bend the cable harness away

from the fuel rail.

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Removal and installation

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ΛΦ45/55 series

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5.

Remove the fuel return pipe from the

pressure-limiting valve on the fuel rail

6.

Loosen the pipe clamps from the high-

pressure pipe to the fuel rail.

7.

Loosen the high-pressure pipe from the high-

pressure pump to the fuel rail on the fuel rail

side by unscrewing the union.

8.

Disconnect the injector pipes.

9.

Remove the fuel rail attachment bolts (2).

10. Remove the fuel rail (3).

Installing the fuel rail
1.

Ensure that the fuel rail is clean.

2.

Fit the fuel rail (3) and hand-tighten the

attachment bolts (2).

3.

Fit the fuel return pipe (1) onto the pressure-

limiting valve on the fuel rail.

4.

Fit the injector pipes.

5.

Fit the pipe clamps from the high-pressure

pipe to the fuel rail. Do not tighten them yet.

6.

Fit the high-pressure pipe unions from the

high-pressure pump to the fuel rail. For the

specified tightening torques of the unions,

see "Technical data".

7.

Tighten the attachment bolts (2) of the fuel

rail to the specified torque. See "Technical

data".

8.

Tighten the bolt connections of the high-

pressure pipe clamps.

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Removal and installation

CE ENGINE FUEL SYSTEM

ΛΦ45/55 series

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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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Removal and installation

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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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