Electrical Fuses; Jump-Starting; Bleeding The Fuel Prefilter With The Manual Fuel Pump - Mercedes-Benz OM 457 LA Operating Instructions Manual

X
Open water release valve B.
X
Press manual fuel 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 man-
ual fuel pump
The fuel prefilter must only be bled when:
the fuel tank is empty or
R
the fuel filter has been replaced.
R
X
Unscrew the fuel tank filler cap.
X
Place the collector underneath the fuel pre-
filter.
X
Open shutoff valve = fully.
X
Open bleed nipple ;.
X
Press manual fuel pump : repeatedly until
the escaping fuel is free of bubbles ;. Do
not continue to pump.
X
Close bleed nipple ;.
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.

Electrical fuses

Important safety notes
G
WARNING
If you manipulate, bridge or replace a faulty
fuse with a fuse of a higher amperage, the
electric cables could be overloaded. This may
result in a fire. There is a risk of an accident
and injury.
Always replace faulty fuses with specified new
fuses of the correct amperage.
The individual electrical circuits are protected
by safety fuses or automatic circuit-breakers.
Blown fuses or defective automatic circuit-
breakers must be replaced by equivalent
fuses with the fuse ratings recommended in
the fuse allocation chart. Fuses with the same
fuse rating are the same colour.
Further information is available from any
Mercedes-Benz, MTU or MTU-authorised
Mercedes-Benz Service Centre (
The vehicle-specific fuse allocation chart is
provided by the vehicle manufacturer.
If the newly inserted fuse also blows, have the
cause traced and rectified at a qualified spe-
cialist workshop, e.g. a Mercedes-Benz Ser-
vice Centre.
X
If a circuit fails, switch off the consumer
equipment and switch the ignition lock to
position 0.
Checking and replacing a safety fuse
X
Pull the fuse out of the module using the
pliers and carry out a visual inspection.
X
If the fuse wire has melted, replace the
blown fuse with a spare fuse.
X
Switch on consumers and check that they
function correctly.
If the safety fuse burns out again, have the
electrical system checked at a qualified spe-
cialist workshop.

Jump-starting

Important safety notes
G
WARNING
Comply with safety precautions and take pro-
tective measures when handling batteries.
Jump-starting
Y
page 10).
Z
83