Fuel System; Fuel System Bleeding - Volvo Penta D25A MS Operator's Manual

Maintenance: Fuel System

Fuel system

Fuel system bleeding

Prime the fuel filters and fuel injection pump in the following sequence:
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Bleeding the fuel filter
1. Put the fuel filter switching cock in the left filter
bleed position and loosen the left air vent plug.
2. Turn the priming pump plunger counterclockwise
to unlock the mechanism.
3. Move the plunger up and down until the fuel flows
free of bubbles from air and tighten the air vent
plug.
4. Put the fuel filter switching cock in the neutral po-
sition and repeat the above-described procedure
for the other fuel filter.