Specifications and requirements

ing and running problems, as well as serious fuel system and internal engine damage.

Gasoline containing ethanol has several properties that may cause boat fuel system problems.

●Ethanol is a strong solvent (cleaning agent) that can clean gum and varnish deposits from a boat’s fuel system, particularly in old- er boats, as well as tanks and pipes used in gasoline distribution. These released de- posits contaminate the fuel and can cause problems, such as clogged fuel filters, car- buretors, or fuel injectors, which could re- sult in engine damage.

●Ethanol may dissolve resins used in the construction of fiberglass fuel tanks. The dissolved resins contaminate the fuel and can cause problems, such as clogged fuel filters, carburetors, or fuel injectors, which could result in engine damage.

●Ethanol is hygroscopic (has a strong attrac- tion to water). Therefore, any water that in- advertently enters the fuel system, including moisture that is absorbed from the air, will mix with the ethanol in the gasoline. If the amount of water is excessive, the eth- anol and water mixture will separate from the gasoline in a layer at the bottom of the fuel tank. This ethanol and water mixture is very corrosive to aluminum fuel tanks and fuel system components.

●The usable life span of E10 gasoline may be shorter than the normal length of off-sea- son boat storage, causing starting and run-

ning problems related to stale fuel.

For more information on using fuel containing ethanol, visit: http://www.yamaha-motor.com

Gasoline Filtration

Yamaha outboard motors are equipped with internal fuel filters. However, excessive water or debris entering your engine’s fuel system could prematurely clog the internal filters, causing starting and running problems, fuel system damage, and internal engine damage. Therefore, it is recommended that an external 10-micron water-separating fuel filter be installed on your boat and serviced frequently. Consult your authorized Yamaha dealer for a 10-micron filter that meets your engine’s re- quirements.

EMU41340

Gasoline Additives

Gasoline blends change to meet automobile emission regulations and economic condi- tions. Additives, added by gasoline distribu- tors, necessary for proper automobile engine operation and durability, may not be sufficient for typical boat applications. Intake valve and combustion chamber deposits may accumulate in boat engines more rapidly than encountered in automotive use. In addition, gasoline used for boating will typically age longer between refills than gasoline used in automobiles, resulting in stale and unusable gasoline that may cause starting and running problems, fuel system damage, and internal engine damage.

Yamaha recommends the use of two Ya- malube gasoline additives to reduce internal deposits and extend the storage life of gaso- line. Continuous use of Yamalube Ring Free Fuel Additive Plus reduces harmful internal deposits. Yamalube Fuel Stabilizer & Conditioner Plus added to fresh gasoline will help protect the fuel system from varnishing while helping to keep the gasoline’s octane level from decreasing excessively during storage. Other additives may also be available on the market that may have varying degrees of ef-

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