MasterCraft prostar 190 2011 Owner'S Manual Download

Page: 95 / 139

Indmar Engines

The following information applies to boats equipped with Indmar engines (which includes the RPT-1,

MCX, LY6 and 8.1L):

What Type of Gasoline To Use

All standard Indmar EFI engines run on unleaded fuel of 89 octane or higher. Indmar recommends pur-

chasing fuel from a supplier that advertises availability of fuel that meets “TOP TIER” specifications. This fuel
has additives and detergents that will reduce the build-up of deposits in the engine.

The goal of the TOP TIER detergent gasoline standards is to create a winning situation for gasoline

retailers, engine manufacturers and boat operators. Currently, many gasoline retailers provide fuels with
lower-quality additive packages that can build up deposits on fuel injectors and intake valves. Others can
build up deposits in combustion chambers and may lead to intake valves sticking. These lower levels of addi-
tives can have a negative impact on engine performance and vehicle responsiveness.

For a current list of gasoline retailers supplying TOP TIER gasoline, go to 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

minimum level listed will void the warranty on the boat.

Fuels that are blended to contain methanol or wood alcohol should not be used. These fuels can cor-

rode metal parts in the fuel system and engine. Fuels that contain methanol will damage the engine.
Damage caused by the use of unapproved fuels is not covered by warranty.

When the Boat Is Not Used for a While

Indmar recommends the regular use of Sta-Bil® fuel stabilizer for boat users whose outings consume less

than a tank of fuel every two (2) weeks. Today’s fuels are more susceptible to degradation, and the use of a qual-
ity stabilizer will help ensure fewer problems for the occasional boater.

If the boat has not been used for more than thirty (30) days and fuel remains in the tank (even stabilized

fuel), the engine may run poorly until the “old” fuel is used up. The manufacturer will not pay for repairs to
components that are inoperable or damaged from old and/or poor quality fuel, as this is not covered under the
engine warranty

Extended storage with fuel in the system can affect the fuel’s stability and may require system
inspection and fuel filter replacement when the unit is placed back into service.

Using Oxygenated Fuels or Fuels with Alcohol

MTBE (methyl tertiary butyl ether) is an oxygenate and octane enhancer. This compound may be blended

with fuel. Fuel that is no more than fifteen percent (15%) MTBE is acceptable for use in the Indmar engine.

Ethyl alcohol, ethanol or grain alcohol is acceptable as long as it is a blend and the blended fuel contains no more

than ten percent (10%) ethanol.

Fuels Outside the United States and Canada

If the Indmar-equipped boat is operated outside the USA or Canada, unleaded fuels may be difficult to

obtain. Leaded fuels are not recommended as engine components will last longer using unleaded fuel.

Volkswagen Diesel Engine

If the MasterCraft boat is equipped with a Volkswagen diesel engine, refer to the owners manual that comes

with it for important information regarding fueling and starting the engine.

2011 Owners Manual...Using Care When Fueling...Page 7-2