Poor quality or old fuels can cause problems such
as loss of performance, rough idling, hard starting
and hesitation. If the engine experiences any of these
symptoms,rst try another brand of gasoline and/or
replace the old gasoline with fresh gasoline.
Many engine manufacturers believe the U.S.
Environmental Protection Agency’s (EPA’s) deter-
gent levels in gasolines do not provide sucient
deposit controls to allow for optimal engine perfor-
mance. As a result, TOP TIER Detergent Gasoline
standards were created to ensure gasolines have all
the necessary additives and detergents to reduce
the build-up of deposits in an engine. ILMOR recom-
mendspurchasingfuelfromasupplierthatconrms
theirfuelmeetsTOPTIERspecications.Foralistof
TOP TIER retailers, check www.toptiergas.com, and
click on “Retailers.”
Damage to the engine by use of low-quality gasoline
or gasoline with an octane rating below the mini-
mum level listed for ILMOR MV8 engines will void
the warranty on the engine.
Using Oxygenated Fuels or Fuels with Alcohol
E-85fuelsarenottobeused!Useofthisfuelmaycauseengineperformancetosuerandmaydamagevitalfuelsystemcomponents.
Fuel that is no more than 15 percent MTBE (methyl tertiary butyl ether) may be used in the MV8 engine. MTBE is an oxygenate and octane
booster. MTBE is used in fuels to meet government mandates. However, because of environmental concerns MTBE is being phased out and replaced
with ethanol or methanol.
Leaded fuels may NOT be used in the MV8 engine. Also DO NOT use E15 fuel.
Gasoline containing levels higher than 10 percent ethanol or methanol is NOT TO BE USED in the MV8 engine. This is primarily due to the fact
that the alcohol in the fuel absorbs water. Water in the fuel can cause corrosion and extensive damage in the fuel system. If the presence of alcohol
in the gasoline is unknown, frequent inspections of the fuel system are required.
When the Boat Is Not Used
for a While
ILMOR recommends the use of Sta-Bil
®
fuel stabilizer if the
boat consumes less than a tank of fuel every couple of weeks. To-
day’s fuels are more susceptible to degradation, and the use of a
quality stabilizer helps ensure fewer problems if the boat is used
only on a limited basis.
If the boat has not been run for more than thirty (30) days and
fuel remains in the tank—even stabilized fuel—the engine may run
with reduced performance until the existing fuel has been used.
The manufacturer will not pay for repairs to components that are
damaged from poor quality fuel as this is not covered under the
engine warranty.
Extended storage with fuel in the system can affect fuel stability
and may require system inspection and fuel filter replacement
when the boat returns to service.
Fuels Outside the United States
and Canada
If the boat is operated outside the United States or Canada, it may
bemorediculttoobtainlead-freefuel.Astheenginecomponentsare
manufactured to function properly only with unleaded gasoline, it may be
necessarytosearchforrenedunleadedgasoline.
MasterCraft 2012 Owners Manual • Preparation • Page 3-3
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