DAF CF65, CF75, CF85 Series . Manual — part 420

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ΧΦ65/75/85 series

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4.2 VENTING THE FUEL SYSTEM

When venting the fuel system, a
quantity of fuel will escape. Collect
the fuel and avoid the risk of fire.

Stop pumping as soon as a
resistance is felt. If you continue
pumping, the fuel system may
become internally damaged.

Note:
When the primer pump is used, the fuel system
will be automatically vented. Air will be fed back
to the tank through the return line.

Racor fuel prefilter/water separator
1.

Open the vent plug (2) a couple of turns.

2.

Pump the primer pump (1) until fuel comes
out of the vent plug (2).

3.

Close the vent plug (2).

4.

Use the primer pump until a clearly higher
resistance is felt.

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Inspection and adjustment

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ΧΦ65/75/85 series

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Fleetguard fuel prefilter/water separator
1.

Unscrew the button of the primer pump and
pull it out.

2.

Use the primer pump until a clearly higher
resistance is perceptible.

3.

Hand-tighten the button.

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200416

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Inspection and adjustment

CE ENGINE FUEL SYSTEM

ΧΦ65/75/85 series

4

2

4.3 CHECKING FUEL LIFT PUMP PRESSURES

When inspecting the fuel pressure,
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.

Checking underpressure on suction side of
fuel lift pump
1.

Disconnect the fuel pipe from the electronic
unit cooling plate to the fuel lift pump on the
suction side of the fuel lift pump; see
"Removal and installation".

2.

Fit the adapter (1), special tool
(DAF no. 1329476), between the pipe which
has been removed and the fuel lift pump and
couple a pressure gauge (2) to this adapter.

3.

Bleed the fuel system.

4.

Measure the underpressure when the engine
is idling. Compare the readings with the
specified values. See "Technical data".

5.

Remove the pressure gauge and the adapter
and fit the fuel pipe.

6.

Bleed the fuel system, start the engine and
check the fuel system visually for leaks if no
further measurements are to be carried out.

Checking fuel pressure in fuel lift pump in
front of fuel fine filter
1.

Disconnect the fuel pipe from the lift pump to
the fuel fine filter on the delivery side of the
lift pump; see "Removal and installation".

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Inspection and adjustment

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ΧΦ65/75/85 series

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2.

Fit the adapter (1), special tool
(DAF no. 1329476), between the pipe which
has been removed and the fuel lift pump and
couple a pressure gauge (2) to this adapter.

3.

Bleed the fuel system.

4.

Start the engine and measure the pressure
when the engine is idling. Compare the
readings with the specified values. See
"Technical data".

5.

Remove the pressure gauge and the adapter
and fit the fuel pipe.

6.

Bleed the fuel system, start the engine and
check the fuel system visually for leaks if no
further measurements are to be carried out.

Checking fuel pressure in fuel lift pump after
fuel fine filter
1.

Disconnect the fuel pipe from the fuel fine
filter to the high-pressure pump on the side of
the high-pressure pump; see "Removal and
installation".

2.

Fit the adapter (1), special tool
(DAF no. 1329476), between the pipe which
has been removed and the high-pressure
pump and couple a pressure gauge (2) to
this adapter.

3.

Bleed the fuel system.

4.

Disconnect the electrical connectors of the
injectors from the valve sleeve.

5.

Start the engine and measure the pressure
when the engine is idling. Compare the
readings with the specified values. See
"Technical data".

6.

Connect the electrical connectors of the
injectors to the valve sleeve.

7.

Remove the pressure gauge and the adapter
and reconnect the fuel pipe.

8.

Bleed the fuel system, start the engine and
check the fuel system visually for leaks if no
further measurements are to be carried out.

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