DAF CF65, Service Manual

Page: 166 / 352

PE ENGINE FUEL SYSTEM
2-2
©
200324
General
5
CF65/75/85 series
4
2.2 SYSTEM DESCRIPTION, UPEC FUEL SYSTEM
The fuel lift pump (3) feeds the fuel from the fuel
tank (1) through the cooling plate (2).
The purpose of the cooling plate (2) is to ensure
that the electronic unit does not become too hot.
The fuel lift pump (3) is fitted opposite the pump
housing (5) and is driven by the camshaft in the
pump housing.
From the fuel lift pump, fuel is forced towards the
fuel fine filter (4).
For the purpose of constant bleeding, there is a
calibrated bore in the fuel fine filter.
After the filter, the fuel enters the pump
housing (5).
The pump units driven by the electronic unit are
fitted in the pump housing (5).
The pump units force the fuel at high pressure
(approx. 1600 bar) to the injectors.
At the end of the supply channel, there is a
pressure relief valve (6) that connects the supply
and discharge channels at a specific supply
channel pressure. The pressure relief valve
ensures a good degree of filling for the pump
units. The discharge channel is connected to the
fuel tank (1) return pipe via the fuel fine filter.
8,5 bar
5 bar
4
6
3
2
5
1
I400425
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