Yamaha F2.5 Owner's Manual page 27

a gasoline that is advertised as Top Tier De-
tergent Gasoline. Failure to comply with these
recommendations may also result in un-
scheduled maintenance, fuel system dam-
age, and internal engine damage.
Recommended fuel:
Regular unleaded gasoline
Min. pump octane number (PON):
86
ECM01981
NOTICE
Do not use leaded gasoline. Leaded gas-
●
oline can seriously damage the engine.
Avoid getting water and contaminants in
●
the fuel tank. Contaminated fuel can
cause poor performance or engine dam-
age. Use only fresh gasoline that has
been stored in clean containers.
Gasoline with Ethanol
Two types of gasoline are commonly avail-
able in the U.S.A. and Canada for use in au-
tomobiles and boats: conventional gasoline
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,
Specifications and requirements
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.
●
●
●
●
For more information on using fuel containing
ethanol, visit: http://www.yamaha-motor.com
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
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.
the fuel system,
21