Mercedes-Benz OM 904-926 LA BlueTec Operating Instructions Manual page 70

Work schedules
68
Leakage fuel from the engine
:
To the fuel pump
;
From the fuel tank
=
Fuel return line to the fuel tank
?
Fuel pump
A
Fuel prefilter with water separator:
replacing the fuel filter
G
WARNING
There is an increased risk of fire when han-
dling fuels as they are highly flammable. Avoid
fire, naked flames and sparks, and refrain
from smoking when handling fuels.
H
Environmental note
Dispose of used filter elements, seals and fuel
residue in accordance with relevant local reg-
ulations.
The fuel prefilter is fitted on the equipment or
vehicle. Observe the operating and mainte-
nance instructions in the equipment/vehicle
operating instructions for the fuel prefilter.
X
Vehicle with fuel prefilter at tank level:
close shutoff valve ?.
X
Place a collector under water drain valve
E.
X
Open water drain valve E and bleed screw
=. Collect the escaping water/fuel mix-
ture.
X
Unscrew filter element A from filter
head :.
X
Unscrew water separator D from filter ele-
ment A and clean or replace as necessary.
X
Replace filter element A.
X
Screw water separator D with new sealing
ring C onto filter element A until it is
hand-tight. Lubricate sealing ring C with a
thin coat of engine oil beforehand.
X
Screw filter element A with new sealing
ring B onto filter head : until it is hand-
tight. Lubricate sealing ring B with a thin
coat of engine oil beforehand.
X
Close water release valve E.
X
Vehicle with fuel prefilter at tank level:
open shutoff valve ?.
X
Push fuel hand pump ; repeatedly until
the fuel escapes free of bubbles from bleed
screw =.
X
Close bleed screw =.