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I - 1
GASOLINE FUEL SYSTEMS
A. Fuel System - Domestic Models
For domestic models, the equipment used by Four
Winns, as described by the manufacturer, is designed
to provide maximum engine fuel flow and minimize
hydrocarbon emissions. Overfill protection helps
prevent the possibility of accidental fuel spills. The
fuel system on the SL series models have automotive
style refueling, to include automatic nozzle shut off
and fuel nozzle retention. Note: The automatic shut
off feature only exists when dispensing fuel with an
auto shut off nozzle.
NOTICE
Gasoline fuel systems used in Four Winns
domestic boats are designed to meet or exceed
the requirements of the Environmental Protec-
tion Agency (EPA), US Coast Guard, California
Air Resources Board (CARB), the National
Marine Manufacturers Association, and the
American Boat and Yacht Council in effect at
the time of manu fac ture.
Fuel Systems - Section I
®
Figure I1: Fuel System Components - Domestic Models
(Representative View - Models May Vary)
These SL series models include an integrated fuel
system which utilizes a carbon canister. See Figure I1.
As the fuel tank is filled with gasoline, pressure rises in
the fuel tank. To prevent over-pressurization, the fuel
limit vent valve expels pressure (which includes gas
vapors) that travel through the fuel vent hose. Before
escaping, the vapors are scrubbed by first passing
through the carbon canister. See Figure I2.
When a predetermined level has been reached the
fuel limit vent valve shuts off. Pressure quickly builds
in the tank and the fuel fill inlet control closes. Fuel no
longer can enter the tank. As the fuel level rises in the
fill hose it shuts off the fuel flow from the fuel nozzle
(just like when you fill your car's fuel tank).
Avoid overboard spills. Be alert. The fuel nozzle
should automatically shut off when using an
automatic shut off nozzle. Be ready in the event
it does not or if you are using a different type of
nozzle for dispensing fuel. DO NOT TOP OFF.
Fuel Systems
Owner's Manual Page 76
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