CE ENGINE FUEL SYSTEM
2-8
©
200416
General
2
ΧΦ65/75/85 series
4
A pressure relief valve (6b) is fitted at the end of
the fuel rail. If the pressure in the fuel rail rises too
high (in emergencies only), this valve ensures
that the excess fuel flows back to the return pipe.
The return pipe is connected with the return pipe
to the fuel tank (1).
The electronic unit uses the present rail pressure
to calculate the time during which the injector
needs to be opened in order to obtain the desired
injection quantity.
A pressure relief valve (8) connects the injector
leak-off ducts in the cylinder head with the return
pipe to the fuel tank (1). This pressure relief valve
prevents the fuel from flowing out of the injectors
when the engine has stopped running.
If the system has been "open", the fuel system
can be bled using the primer pump (2a), which
is integrated in the water separator/coarse
filter (2b).
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