Bleeding The Fuel System - Yanmar 2YM15 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. Manual 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.
Bleeding the Fuel System
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.
YM Series Operation Manual
2.
3.
4.
(1)
5.
6.
(2)
Note: After engine start-up, the automatic
air-bleeding device works to purge the air in
(3) the fuel system.
(4)
(5)
(6)
0004801
© 2007 Yanmar Marine International
BEFORE YOU OPERATE
Open the fuel cock of the fuel tank.
WARNING! Always wear safety
glasses when bleeding the fuel
system.
Loosen the air-bleed screw
(Figure 4, (1)) 2 to 3 turns.
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.
Continue pumping until a solid stream
of fuel with no air bubbles begins to
flow.
Tighten the air-bleed screw.
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