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Fuel system
DANGER!
Gasoline is extremely flammable and highly explo-
sive. ALWAYS turn off the engine before fueling. Do
not smoke or allow open flames or sparks near the
boat when adding fuel. When filling the gas tank,
ground the tank to the source of gasoline by holding
the hose nozzle firmly against the side of the deck
filler plate, or ground it in some other manner. This
action prevents static electricity buildup that could
cause sparks and ignite fuel vapors .
Gasoline recommendations
USE ONLY UNLEADED FUEL. Maximum engine perfor-
mance requires the use of lead-free gasoline with the following
minimum or higher octane specification:
Inside the U.S.: (R+M)/2 (AKI) – 89
Outside the U.S.: (RON) – 93
If fuels with 89 AKI pump posted (93 RON) octane number or
higher are not available, lower octane fuels (minimum 87 AKI
[90 RON] octane) can be used. With the use of lower octane
fuel, a slight decrease in power can be expected.
Premium fuel contains injector cleaners and other additives
that protect the fuel system and provide optimum performance.
Volvo Penta strongly recommends the use of premium grade
fuels.
Gasoline will degrade over time. Always buy your gasoline
from a reputable dealer.
CAUTION!
Engine damage resulting from the use of a lower oc-
tane gasoline than 87 AKI (90 RON) is considered mis-
use of the engine. Any resulting engine damage will
not be covered by the warranty.
7741591 / 2003-12
Gasoline containing alcohol
Many brands of gasoline being sold today contain alcohol. Two
commonly used alcohol additives are Ethanol (ethyl alcohol)
and Methanol (methyl alcohol).
See your boat's owner's manual to see if the boat's fuel system
is compatible with alcohol blended fuels. If it is, your engine
may be operated using gasoline blended with no more than
10% Ethanol meeting the minimum octane specification.
CAUTION!
Do not use any gasoline that contains METHANOL.
Serious damage will result from the continued use of
fuel containing METHANOL. Any resulting engine
damage will not be covered by the warranty.
If you use gasoline that contains ethanol, be aware of the fol-
lowing:
·
The engine will operate leaner with ethanol blended fuel.
This may cause engine problems such as vapor lock, low
speed stall, or hard starting.
·
Ethanol blended fuels attract and hold moisture. Moisture
inside fuel tanks can cause corrosion of the tank material.
Inspect fuel tanks at least annually. Replace fuel tanks if
inspection indicates leakage or corrosion.
Detonation (spark knock)
Carbureted models: Detonation, or spark knock, in a marine
engine is not necessarily audible. Overheating and continued
running ("dieseling") after ignition shut-off are indications of
detonation in a marine engine. If you suspect detonation or
spark knock, and the engine is tuned properly, change to a
higher octane fuel.
EFI models: Detonation, or spark knock, is continually moni-
tored by the electronic fuel injection (EFI) system. The EFI's
computer (ECM) will automatically alter spark advance to help
to prevent engine damage if knock is detected, and there will
be a slight loss of power.
Maintenance
61
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