Yanmar 3JH5E - Bleeding the Fuel System

BEFORE YOU OPERATE
38 JH 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 5 applies to both 4JH5E and 3JH5E.
Figure 5
1 – Fuel Injector
2 – Fuel Filter
3 – Header (fuel filter)
4 – Electric Fuel Feed Pump
5 – Fuel Injection Pump
1. Check the fuel level in the fuel tank.
Refill if necessary.
2. Open the fuel cock of the fuel tank.
3. To bleed air from the fuel filter, loosen
the hose clamp on the return side fuel
hose (Figure 5, (4)) at the T-joint.
Remove the hose.
4. Push the power switch on to activate
the electric fuel feed pump.
5. Continue pumping until a solid stream
of fuel with no air bubbles begins to
flow from the T-joint. Push the power
switch off.
6. Install the return side fuel hose onto the
T-joint. Tighten hose clamp.
Bleeding the Fuel System - 4JH4-TE
and 4JH4-HTE1, 4JH4-HTE
Figure 6
1–Priming Pump
2 – Air Bleed Screw
3 – From Fuel Tank
4 – To Fuel Injection Pump
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 6, (2)) twotothree turns.
4. Push up and down on the priming
pump (Figure 6, (1)) to release air out
of the air bleed screw.
027141-00X
(1)
(2)
(3) (6)
(4)
(5)
(1)
(2)
(
3)
(4)
0004494
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