Yanmar 3YM30E - Bleeding the Fuel System

BEFORE YOU OPERATE
30 YM Series Operation Manual
Bleeding the Fuel System
The fuel system has an automatic air
bleeding device that purges air from the
fuel system. No manual air bleeding is
required for normal operation. Bleeding
must be done if any fuel system
maintenance has been performed
(replacement of fuel filter, etc.) or if the
engine does not start after several
attempts.
Figure 4
1 – Air Bleed Screw
2 – Bracket
3–O-Ring
4 – Fuel Filter Element
5 – Fuel Filter Housing
6 – Retaining Ring
1. Check the fuel level in the fuel tank.
Refill if necessary.
2. Open the fuel cock of the fuel tank.
WARNING
Exposure Hazard.
Always wear safety glasses when
bleeding the fuel system.
3. Loosen the air bleed screw (Figure 4,
(1)) 2 to 3 turns.
4. Push up and down on the manual
priming lever located on the side of the
fuel feed pump to release air out of the
air bleed screw. Always use an
approved container to catch the diesel
fuel.
5. Continue pumping until a solid stream of
fuel with no air bubbles begins to flow.
6. Tighten the air bleed screw.
Note: After engine start-up, the
automatic air-bleeding device
works to purge the air in the fuel
system.
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