General Operations/Modifications; Vehicles With Fuel Prefilter - Mercedes-Benz 963 2022 Series Manual

General notes
Environmental note
Dispose of the water/fuel mixture in an
environmentally safe manner.
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Drain fuel prefilter
Fuel prefilter (Actros)
• Open the cap of the fuel tank.
• Place a container under drain screw (2).
• Open drain screw (2).
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Bleed fuel prefilter
• Open the cap of the fuel tank.
• Place collecting pan under fuel prefilter (1).
• Slacken bleed screw (5).
• Actuate hand pump (4) until fuel emerges bubble-free
at vent screw (5).
• Tighten vent screw (5).
If there was no fuel in the fuel tank, press hand pump
(4) again until a perceivable resistance is perceptible.
• Also bleed with the hand pump at the engine.
• Close the cap of the fuel tank.
• Shift transmission to neutral.
Actros, Antos and Arocs | Towing and recovery

Vehicles with fuel prefilter

When the water has separated in the inspection glass
(3), drain the fuel prefilter (1) before bleeding. Drain fuel
prefilter (1) regularly.
• Press on hand pump (4) and collect water/fuel
mixture.
• Close drain screw (2).
• Apply parking brake.
• Press start/stop button (6) as far as end stop and
hold. Do not depress the accelerator pedal.
The starting procedure is automatically interrupted.
• If the engine ignites regularly, release start/stop
button (6) and depress accelerator pedal several
times.
The fuel system will bleed itself fully.
• If the engine does not start, bleed using the hand
pump at the engine.
• If the engine fails to start, check the fuel system.
W47.20-A009-71
W15.10-A000-71
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