Gasoline Additives - Yamaha F50 Owner's Manual

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Table of Contents

Specifications and requirements

without Ethanol and gasoline with Ethanol,

which is typically referred to as E10 gasoline.

According to federal regulations, E10 gaso-

line may contain up to 10% Ethanol.

A high quality gasoline without Ethanol is the

preferred fuel for your Yamaha outboard mo-

tor. However, if gasoline with Ethanol is the

only fuel available in your area, your Yamaha

outboard motor is calibrated to run properly

on fresh E10 gasoline that meets the mini-

mum octane requirement specified for this

model.

ECM02401

NOTICE

Never use a gasoline for your outboard

motor that contains more than 10% Etha-

nol, such as E15 which contains 15% Eth-

anol or E85 which contains 85% Ethanol,

or gasoline containing any amount of

Methanol. These fuels can cause starting

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 de-

posits from a boat's fuel system, particular-

ly in older boats, as well as tanks and pipes

used in gasoline distribution. These re-

leased deposits contaminate the fuel and

can cause problems, such as clogged fuel

filters, carburetors, or fuel injectors, which

could result 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 at-



traction to water). Therefore, any water

that inadvertently enters the fuel system,

including moisture that is absorbed from

the air, will mix with the ethanol in the gas-

oline. If the amount of water is excessive,

the ethanol 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-

season boat storage, causing starting and

running problems related to stale fuel.

For more information on using fuel contain-

ing ethanol, visit: http://www.yamaha-mo-

tor.com

Gasoline Filtration

Yamaha outboard motors are equipped with

internal fuel filters. However, excessive wa-

ter or debris entering your engine's fuel sys-

tem could prematurely clog the internal

filters, causing starting and running prob-

lems, fuel system damage, and internal en-

gine damage. Therefore, it is recommended

that an external 10-micron water-separating

fuel filter be installed on your boat and ser-

viced frequently. Consult your authorized

Yamaha dealer for a 10-micron filter that

meets your engine's requirements.

EMU41341