DAF 95XF. Manual - part 411

4

XE ENGINE FUEL SYSTEM

Safety instructions

95

XF series

1-2

5

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 0008

4

95

XF series

General

XE ENGINE FUEL SYSTEM

2-1

2.  GENERAL

2.1

LOCATION OF COMPONENTS

1

2

  i 400390 

4

5

6

7

3

10

9

8

11

13

12

1.

Pump units with magnetic valve

2.

Pump housing

3.

Fuel fine filter

4.

Fuel lift pump

5.

Pressure-relief valve in pump housing

6.

Hand pump with fuel coarse filter

7.

Leak-off pipe

8.

Supply pipe, hand pump

9.

Pipe, hand pump - fuel lift pump

10. Fuel fine filter return line
11.

Return pipe, pump housing

12. Pipe, fuel fine filter - pump housing
13. Pipe, fuel lift pump - fuel fine filter

©

 0008

5

4

XE ENGINE FUEL SYSTEM

General

95

XF series

2-2

2.2

DESCRIPTION OF UPEC FUEL SYSTEM

8,5 bar

2,8 bar

4

5

3

2

6

1

I400218

The fuel lift pump (3) is installed against the
pump housing (6) and is driven by the camshaft
in the pump housing.
From the fuel lift pump the fuel is forced to the
fuel fine filter (4).
To achieve permanent bleeding of the
low-pressure area, a banjo bolt with a calibrated
hole has been installed in the head of the fuel
fine filter (4).
A small quantity of fuel will also escape through
this calibrated hole.
But because the hole is so small, and the fuel
supply is large, pressure will be built up in the
fuel fine filter (4), and the fuel will be forced on
to the pump housing (6).

5

©

 0008

4

95

XF series

General

XE ENGINE FUEL SYSTEM

2-3

The pump housing (6) accommodates the pump
units which are driven by the electronic unit.
The pump units force the fuel to the injectors at
a high pressure (approx. 1400 bar).

A pressure-relief valve (5) is installed on the
return connection of the pump housing (6).
This pressure-relief valve ensures that the pump
units are filled properly.

A fuel coarse filter with hand pump (2) is also
installed in the fuel system.
The hand pump is used to bleed the system
after it has been “opened”.

5

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 0008