remove any obstruction with a pipe cleaner or similar
device. Be sure not to puncture the screen. The
vent screens are designed to keep insects and foreign
matter from contaminating the fuel and fuel system.
The stainless steel cap is not removable.
DO NOT confuse FUEL deck ﬁll plate with
WATER or WASTE deck plates. Deck ﬁll
plates are labeled according to the intended
D. Anti-Siphon Valves
The gasket/O-ring seals on the fuel ﬁll cap assist in
sealing when closed. A missing or damaged O-ring
can allow water on the surrounding surfaces to run
into the tank.
The fuel withdrawal line is equipped with an anti-
siphon valve where the line attaches to the fuel tank.
The valve prevents gasoline from siphoning out of
the fuel tank should a line rupture. See Figure I4 for
Periodically inspect the cap and the fuel deck plate.
The O-ring seal should be inspected for cracks or
damage and replaced as necessary. Lubricating with
a light, waterproof oil or grease is recommended and
can extend the O-ring’s longevity.
C. Fuel Vents
On the 338 Vista® separate thru-hull fuel vents are
installed. See Figure I3. While the tank is being ﬁlled,
the air displaced by the fuel escapes through the vent
Spilled fuel is a ﬁre and explosion hazard. DO
NOT overﬁll or overﬂow the tank, or allow fuel
spills into the hull or bilge. If spillage occurs,
clean up immediately and dispose of soiled
rags/towels in a proper container.
Figure I4: Fuel Tank Fittings
DO NOT remove the anti-siphon valve(s)
from the system. Should the valves become
clogged, clean and reinstall or replace.
Avoid overboard spills. When tank is almost
full the sound from the fuel vent will change.
The pitch will become higher indicating the
tank is close to being full. Stop pumping fuel
into tank. Do not top off.
The fuel withdrawal is positioned in the fuel
tank to achieve optimum fuel usage, and fuel
line routing. At certain speeds and hull trim
angles, the fuel supply at the withdrawal can
increase or decrease accordingly. Be extremely
careful when attempting to operate the boat on
a minimum amount of fuel. Though some fuel
may be in the tank, the relative trim angle of
the boat may cause the fuel to ﬂow away from
When fueling at a marina, DO NOT overﬁll.
Fuel may spill into the water.
After fueling, replace the ﬁll cap, and wash the areas
around the fuel ﬁll plate and below the fuel vent.
Residual fuel left on the deck and hull sides can be
dangerous, and will yellow the ﬁberglass. It will also
damage the tape stripes and logos.
On all Vista models, access to the anti-siphon
valve and fuel sender is by either an access
plate or through the engine compartment.
For those models with thru-hull venting, periodically,
inspect the fuel vent(s) for any dirt, wax, etc. Carefully
Fuel Systems - Section I
Owner’s Manual Page 84
|Categories||Four Winns Manuals, Four Winns Vista Manuals, Outboard Marine Corporation Manuals|
|Tags||Four Winns Vista 338|
|Model Year||2007, 2008|
|Document Type||Owner's Manual|
|Product Brand||Boats and Cruisers, Four Winns. For support contact your dealer at http://www.fourwinns.com/locate-dealer.aspx|
|Document File Type|
|Wikipedia's Page||Outboard Marine Corporation|
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