Volvo Penta D25A MS Operator's Manual page 45

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Bleeding the fuel injection pump
1. Loosen the air vent cock on the fuel injection
pump about 1.5 turns.
2. Move the priming pump cap up and down to start
the flow of fuel through the system.
3. When the fuel coming out of the air vent cock
shows no visible bubbles, lock the priming pump
cap while holding it down. Then tighten the air
vent cock.
Be sure to lock the priming pump cap before tight-
ening the air vent plugs and cock. If this is not
done the cap does not return to the original posi-
tion due to the pressure in the priming pump.
4. Tighten the priming pump cap by hand until the
tightening force increases, normally this occurs
after turning it approximately 70 to 90 degrees.
Mark this position on the priming pump cap to
make item 5 work more easily.
5. Tighten the priming pump cap an additional 120
to150 degrees using a wrench.
6. Clean the engine from spoiled fuel to prevent fire
and pollution of the environment.
IMPORTANT! If the priming pump cap is tighte-
ned too much (more than 240 degrees in total),
the top of the priming pump can be damaged.
IMPORTANT! Looseness of the priming pump
cap in combination with engine vibration may
cause engine failure and damage to the installa-
tion.
Maintenance: Fuel System
45