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BEFORE YOU OPERATE
Bleeding the Fuel System
1.
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.
2.
3.
4.
5.
Bleeding the Fuel System - 3JH4E
6.
Check the fuel level in the fuel tank.
Refill if necessary.
Open the fuel cock of the fuel tank.
Loosen the air bleed screw
(Figure 5, (2)) 2 - 3 turns.
Push up and down on the priming pump
(Figure 5, (1)) to release air out of the
air bleed screw.
Continue pumping until a solid stream
of fuel with no air bubbles begins to
flow.
Tighten the air bleed screw.
Note: After engine start-up, the automatic
air-bleeding device works to purge the air in
the fuel system.
(2)
Bleeding the Fuel System - 4JH4AE
(3)
(1)
(4)
(2)
(3)
(1)
(4)
(5)
(5)
(6)
0004555
Figure 6
(6)
Figure 5
1–
2–
3–
4–
5–
6–
32
Fuel Injector
Air Bleed Screw
To Fuel Tank
Fuel Filter
Fuel Injection Pump
Fuel Feed Pump
0004554
1–
2–
3–
4–
5–
6–
Fuel Injector
Fuel Filter
Priming Pump
Air Bleed Screw
Fuel Feed Pump
Fuel Injection Pump
1.
Check the fuel level in the fuel tank.
Refill if necessary.
Open the fuel cock of the fuel tank.
Loosen the air bleed screw
(Figure 6, (4)) 2 - 3 turns.
2.
3.
JH4 Series Operation Manual
© 2008 Yanmar Marine International