FUELING
8-2
• Moisture: Alcohol-blended fuels absorb and keep
moisture. Moisture inside the fuel tank causes many
engine problems.
• Performance: Alcohol-blended fuels cause the en-
gine to operate on a leaner fuel/air ratio and may
cause hard starting, stalling and vapor lock. Engine
damage may result.
• Deterioration: Alcohol quickly deteriorates rubber
and plastic components in the fuel system, causing
more frequent inspection and replacement of parts.
This increases the potential for fire and explosion
due to fuel leakage. The new fuel system, however, is
designed to withstand alcohol and MTBE fuel addi-
tives commonly found in the new “oxygenated” fuels.
We still recommend fuels with as little alcohol as pos-
sible due to the moisture absorption problem identi-
fied above.
NOTE: Fuel additives and treatements, other than
conditioners for moisture absorption and winter stor-
age are not recommended for use in MasterCraft
Power engines.
Using Oxygenated Fuels or Fuels with Alcohol
MBTE (methl butyl tertiary ether) is an oxygenate and
octane enhancer. This compound is blended with fuel in
some parts of the country. Fuel that is no more than
15% MBTE is acceptable for use in your engine. Ethyl
alcohol or grain alcohol is acceptable for use as long as
it is a blend and the blended fuel contains no more than
10% ethanol.
Type of Gasoline to Use
Gasoline should meet the specifications
ASTM D4814 in the United States and CGSB 3.5-
92 in Canada.
If you operate your engine in a country other than
the United States or Canada, unleaded fuels may be dif-
ficult to locate. Using leaded fuels in your engine is not
recommended as engine components will last longer
using unleaded fuel. (Leaded fuel is not compatible with
today’s engines.)
When a Boat Does Not Run for a While
The engine manufacturer recommends the use of a
stablizer such as Sta-Bil
®
fuel stabilizer for boat users
who consume less than a tank of fuel every two weeks.
Today’s fuels are more susceptible to degradation and
the use of a quality stablizer will help ensure fewer prob-
lems for the occasional boater.
If your boat has not been used for more than
30 days during which fuel remained in the tank
(even stablized fuel), the engine may run poorly
until the “old” fuel is used up. Engine parts and
fuel injection components rendered inoperable
or damaged from old and/or poor-quality fuel will
not be covered under warranty!
Always tighten the fuel plate cap completely with
the cap key after refueling.
Take care not to spill gasoline. If gasoline is spilled accidentally, wipe
up all traces of it with dry rags immediately and properly on shore.
Gasoline is extremely flammable and highly explosive under certain
conditions. Always stop the engine and never smoke or allow open
flames or sparks within 50 feet of the fueling area when refueling.
Fuels that are blended to contain methanol or wood alcohol are not to
be used in MasterCraft engines. These fuels can corrode some metal
parts in your fuel system and engine. Damage caused by the use of
unapproved fuels is not covered by warranty.
Extended storage with fuel in the system can affect the fuel’s stabil-
ity and may require system inspection and fuel filter replacement
when the unit is placed back into service.
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