Specifications

2005 MASTERCRAFT OWNERS MANUAL–PA G E 7-1
FUELING
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The ignition timing as set by the factory requires the use of unleaded fuel with an Anti-Knock Index Number (AKI)/Pump
Octane Number range between 89 octane and 93 octane. Nearly any medium-grade gasoline available for automotive use
may be used.
FUEL SYSTEMS
The ProStar and MariStar models are equipped with a new,
highly innovative fuel system. This system is designed to pro-
vide you with years of trouble-free service. Some of the latest
innovations related to fuel handling safety are also incorpo-
rated into the fuel delivery system.
The system uses a fuel pump mounted in a capsule that is
installed directly in a fuel tank. A similar system has been used
in automotive vehicles for over a decade and has provided
years of proven service.The pump system in your boat was
specifically designed for the marine environment and contains
a number of added safety components that are unique to the
marine system. Because of the special nature of the design,
there are no user-serviceable parts. Any parts in need of ser-
vice or maintenance will need to be addressed by your
MasterCraft dealer. The technical team there is equipped with
the special tools needed to disassemble and service the fuel
capsule and associated parts.
The fuel line that travels in the boat’s bilge area from the
tank to the engine is a special multi-layer armored line that is
covered with a special material known as a fire sleeve. The fire
sleeve affords protection to the fuel line in the unlikely event
of a boat fire.
The sleeve is colored orange in order to afford easy identi-
fication to the fuel line. MasterCraft recommends daily inspec-
tion of the bilge for foreign materials and the possibility of gas
or oil leakage detection. As part of your daily inspection,
include a visual check of the orange fire-sleeved fuel line. If
you see damage to the sleeve or line–or in any way suspect
damage or fuel leakage, DO NOT START YOUR BOAT! Im-
mediately call your MasterCraft servicing dealer and let him or
her assess the situation.
ALTERNATIVES AND ADDITIVES
We do not recommend that you use alcohol-modified fuels
in your MasterCraft boat because of the following side effects:
• Moisture: Alcohol-blended fuels absorb and keep
moisture. Moisture inside the fuel tank causes many
engine problems.
• Performance: Alcohol-blended fuels cause the engine to
operate on a leaner fuel/air ratio and may cause hard start-
ing, stalling and vapor lock. Engine damage may result.
• Deterioration: Alcohol quickly deteriorates rubber and plas-
tic 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 additives commonly found in the new “oxygen-
ated” fuels. We still recommend fuels with as little alcohol
as possible due to the moisture absorption problem identi-
fied above.
NOTE: Fuel additives and treatments, other than condi-
tioners for moisture absorption and winter storage 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 alco-
hol 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 difficult 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 problems for the
occasional boater.
If your boat has not been used for more than 30 days dur-
ing 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.