PERIODIC MAINTENANCE
Periodic Maintenance Procedures
4-12
BY Service Manual
© 2009 Yanmar Marine International
Draining Water and Sediment from Fuel
Tank
WARNING! Fire and Explosion Hazard. When
you are draining the fuel tank to perform
maintenance, put an approved container under
the opening to catch the fuel. NEVER use a
shop rag to catch the fuel. Vapors from the rag
are flammable and explosive. Wipe up any
spills immediately. Wear eye protection. The
fuel system is under pressure and fuel could
spray out when you remove any fuel system
component.
1. Turn engine off.
2. Put a container under the drain cock
(Figure 4-4, (2)) to catch fuel.
Figure 4-4
Figure 4-4
1 – Sediment Bowl
2 – Drain Cock
3 – Fuel Line to Engine
Note: Typical fuel tank shown. Actual
equipment may differ.
3. Open the drain cock and drain water and
sediment. Close the drain cock when the fuel is
clean.
4. Dispose of waste properly.
Replacing the Fuel Fine Filter
1. Disconnect the battery negative (-) cable.
2. Close the fuel tank cock.
3. Unscrew and remove filter cartridge
(Figure 4-5, (1)).
Figure 4-5
Figure 4-5
4. Replace rubber seal.
5. Replace filter. NOTICE: When replacing fuel
filters, always pre-fill them with fresh, clean fuel
to improve the system’s ability to be bled.
6. Hand-tighten cartridge to filter.
7. Connect battery negative (-) cable.
8. Bleed the fuel system and check for leaks. See
Bleed the Fuel System on page 6-22.
Replacing the Fuel Filter / Water Separator
Element
Note: Yanmar supplies a water separating
pre-filter separate from the engine.
Location and type of filter may vary.
1. Disconnect the battery negative (-) cable.
2. Close the fuel tank cock.
3. Loosen the drain plug (Figure 4-6, (4)) on the
bottom of the fuel filter / water separator and
drain off any water or sediment.
0004542
(
3
)
(1)
(2)
(1)
00066
38
