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Specifications and requirements
leased deposits contaminate the fuel and
can cause problems, such as clogged fuel
filters, carburetors, or fuel injectors, which
could result in engine damage.
Ethanol may dissolve resins used in the
construction of fiberglass fuel tanks. The
dissolved resins contaminate the fuel and
can cause problems, such as clogged fuel
filters, carburetors, or fuel injectors, which
could result in engine damage.
Ethanol is hygroscopic (has a strong at-
traction to water). Therefore, any water that
inadvertently enters the fuel system, in-
cluding moisture that is absorbed from the
air, will mix with the ethanol in the gasoline.
If the amount of water is excessive, the eth-
anol and water mixture will separate from
the gasoline in a layer at the bottom of the
fuel tank. This ethanol and water mixture is
very corrosive to aluminum fuel tanks and
fuel system components.
The usable life span of E10 gasoline may
be shorter than the normal length of off-
season boat storage, causing starting and
running problems related to stale fuel.
For more information on using fuel containing
ethanol, visit: http://www.yamaha-motor.com
Gasoline Filtration
Yamaha outboard motors are equipped with
internal fuel filters. However, excessive water
or debris entering your engine's fuel system
could prematurely clog the internal filters,
causing starting and running problems, fuel
system damage, and internal engine dam-
age. Therefore, it is recommended that an ex-
ternal 10-micron water-separating fuel filter
be installed on your boat and serviced fre-
quently. Consult your authorized Yamaha
dealer for a 10-micron filter that meets your
engine's requirements.
20
EMU41342
Gasoline Additives
Gasoline blends change to meet automobile
emission regulations and economic condi-
tions. Additives, added by gasoline distribu-
tors, necessary for proper automobile engine
operation and durability, may not be suffi-
cient for typical boat applications. Intake
valve and combustion chamber deposits
may accumulate in boat engines more rapidly
than encountered in automotive use. In addi-
tion, gasoline used for boating will typically
age longer between refills than gasoline used
in automobiles, resulting in stale and unus-
able gasoline that may cause starting and
running problems, fuel system damage, and
internal engine damage.
Yamaha recommends the use of two
Yamalube gasoline additives to reduce inter-
nal deposits and extend the storage life of
gasoline. Continuous use of Yamalube Ring
Free Fuel Additive Plus reduces harmful inter-
nal deposits. Yamalube Fuel Stabilizer &
Conditioner Plus added to fresh gasoline will
help protect the fuel system from varnishing
while helping to keep the gasoline's octane
level from decreasing excessively during
storage. Other additives may also be avail-
able on the market that may have varying de-
grees of effectiveness. Consult your Yamaha
dealer concerning what may work best for
the locally available gasoline and environ-
mental conditions.
EMU36881
Muddy or acidic water
Yamaha strongly recommends that you have
your dealer install the optional chromium-
plated water pump kit if you use the outboard
motor in muddy or acidic water conditions.
However, depending on the model it might
not be required.
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