Specifications

FUELING
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, MariStar and X-Series models are equipped
with a new, highly innovative fuel system. This system is
designed to provide you with years of trouble-free service.
Some of the latest innovations related to fuel handling safety
are also incorporated 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 service or maintenance will need to be
addressed by your MasterCraft dealer. The technical team
there is equipped with the special tools needed to disas-
semble 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
identification to the fuel line. MasterCraft recommends daily
USING CARE
inspection 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! Immediately 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 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
possible due to the moisture absorption problem
identified above.
NOTE: Fuel additives and treatments, other than
conditioners 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 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.
2006 MasterCraft Owners Manual–Page 6-1