Draining the fuel prefilter
H
Environmental note
Dispose of the water-fuel mixture in an envi-
ronmentally responsible manner.
Drain the fuel prefilter regularly.
X
Place a collector under water release valve
B.
X
On vehicles with fuel prefilter at tank level:
close shutoff valve =.
X
Unscrew water release valve B.
X
Briefly press fuel hand pump : and
collect
the fuel/water mixture.
X
Close water release valve B.
X
On vehicles with fuel prefilter at tank level:
open shutoff valve =.
X
Start the engine and allow it to run for about
one minute.
The fuel system is bled automatically.
X
Check the fuel system for leaks.
Bleeding the fuel prefilter with the fuel
hand pump
The fuel prefilter must only be bled when:
R
the fuel tank is empty or
R
the fuel filter has been replaced.
X
Unscrew the fuel tank filler cap.
X
Place the collector underneath the fuel pre-
filter.
X
Open shutoff valve = fully.
X
Open vent valve ;.
X
Only press fuel hand pump :
until
the fuel
escaping from vent valve ; is free of bub-
bles. Do not continue to pump.
X
Close vent valve ;.
X
Close the fuel tank filler cap.
X
Start the engine.
The fuel system is bled automatically.
!
Do not continue to press the fuel hand
pump after the engine has started. This
could otherwise damage the hand pump.
Activating engine emergency running
mode
Emergency mode for on-highway
applications
Emergency mode can be activated for road
vehicles with Euro 4/5 certified engines (on-
highway engines).
Example: indicator lamp malfunction
The engine is equipped with an electronic
management system that monitors both the
engine and itself (self-diagnostic system).
The k indicator
lamp lights up in the event
of a malfunction. Error messages can be dis-
played as code or text in the display, depend-
ing on the vehicle's display format.
After a malfunction, the engine can be acti-
vated again in emergency mode with a limited
constant engine speed. In engine emergency
running mode, the accelerator pedal is not
operational and the engine speed is limited to
approximately 1300 rpm.
X
To activate engine emergency running
mode: stop
the vehicle, paying attention to
the road and traffic conditions.
X
Engage the parking brake.
X
Switch off the engine.
X
Restart the engine after approximately
10 seconds.
i
The STAR DIAGNOSIS or minidiag2 diag-
nostic equipment can be connected to the
14-pin diagnostic socket or by using the
EU-compliant service connector. The fault
memory and engine data can be read out
Activating engine emergency running mode
87
Breakdown assistance
Z
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