Fuel Systems; Gasoline Fuel System - Domestic Models - Four winns V Series Owner's Manual

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FUEL SYSTEMS

A. Gasoline Fuel System - Domestic Models
NOTICE
Fuel systems used in Four Winns
boats are designed to meet or exceed the
requirements of the Environmental Protection
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.
These V series models, whether single or twin tanks
include an integrated fuel system. See Figure I1. As
the fuel tank(s) 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 and out
the fuel fill/vent. See Figure I1.
When a predetermined level has been reached the
fuel limit vent valve shuts off. Pressure quickly builds
Figure I1: Fuel System Components & Hose Routing - Domestic Models
Fuel Systems - Section I
domestic
®
(Single Fuel Tank Shown Representative View - Models May Vary)
-
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.
When the pressure reduces in the fuel tank the fuel fill
inlet control opens and allows the remaining fuel in the
fuel line to drain into the fuel tank.
It should also be noted that when the air temperature
rises so does the pressure in the fuel tank. When this
happens, the pressure is released through the grade
valves depending upon the level of the fuel in the tank.
The gas vapors are scrubbed by the carbon canister
before being released into the air through the fuel P-
trap vent(s). See Figures I1 & I2. As the temperature
Fuel Systems
Owner's Manual Page 106