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Fuel System
shutoff valves will not allow additional fuel to be
added after they close and could be damaged by
attempts to force additional fuel into the tank.
After fueling, close and latch the ll cap. Then
wash spilled fuel from the areas around the fuel
ll if necessary. Residual fuel left on the deck and
hull sides can be dangerous and will yellow the
berglass or damage the striping.
5.2 Outboard Engine Fuel System
The gasoline fuel system has one fuel tank that
lls from the port gunnel. Each engine is supplied
by an independent withdrawal tube and fuel line.
Triple engines will have three withdrawal tubes
and fuel lines and quads with have four. There
is an on/off valve for each supply line located on
the fuel tank near each withdrawal tube. The
valves provide a means to turn off the fuel supply
to service the fuel system.
Typical Yamaha Quad Engine Fuel Filters & Primer Bulbs
Fuel withdrawal lines are equipped with anti-
siphon valves where the lines attach to the fuel
tanks. These valves prevent gasoline from siphon-
ing out of the fuel tank should a line rupture.
DO NOT REMOVE THE ANTI-SIPHON VALVES FROM THE SYSTEM.
SHOULD AN ANTI-SIPHON VALVE BECOME CLOGGED, CLEAN
AND REINSTALL OR REPLACE. IF A FUEL LINE SHOULD LEAK,
ANTI-SIPHON VALVES PREVENT A SUBSTANTIAL AMOUNT OF
FUEL FROM FLOWING INTO THE BILGE. ANTI-SIPHON VALVES
ARE REQUIRED TO BE INSTALLED IN ALL BOATS EQUIPPED
WITH GASOLINE ENGINES BY THE U.S. COAST GUARD
Engine Fuel Filters
On most engine installations, the fuel lter for
each engine is installed in the stern mechanical
systems compartment. The lters are accessed
through the hatch at the rear of the cockpit sole.
The lters are the water separator type and should
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