Maintenance and Service
Diesel engine
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7.1.3.3 Bleeding the fuel system
– Call up on the R-Touch menu "Special functions".
– Choose in the line "Service fuel filter" option "ON". The electric pump is switched
on. The R-Touch displays the actual fuel pressure in mbar. The fuel pressure
increases for some time and remains constant at about 3500 mbar. Wait approxi-
mately another 2 minutes. Thus, the fuel system is vented.
– Start diesel engine.
Hand steering articulation
Reverse ventilator drives
Programmable keys activation
B638 fuel pressure fine filter
ADVICE
When the diesel engine is running the On option cannot be activated. The option is
automatically reset to OFF while the engine is running.