Anti-Siphon Valves - Four winns 338 Vista Owner's Manual

DO NOT confuse FUEL deck fill plate with
WA TER or WASTE deck plates. Deck fill
plates are labeled according to the intend ed
use.
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.
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 es capes through the vent
overboard.
Spilled fuel is a fire and explosion haz ard. DO
NOT ove rfill or ove rflow the tank, or al low fuel
spills into the hull or bilge. If spill age oc curs,
clean up im me di ately and dis pose of soiled
rags/towels in a pro per con tain er.
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.
NOTICE
When fueling at a marina, DO NOT over fill.
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 fiber glass. It will also
damage the tape stripes and logos.
For those models with thru-hull venting, periodically,
inspect the fuel vent(s) for any dirt, wax, etc. Carefully
Fuel Systems - Section I
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 sys tem.
The stainless steel cap is not removable.
D. Anti-Siphon Valves
The fuel withdrawal line is equipped with an anti -
siphon valve where the line attaches to the fuel tank.
The valve prevents gasoline from siphon ing out of
the fuel tank should a line rupture. See Figure I4 for
anti-siphon location.
Figure I4: Fuel Tank Fittings
DO NOT remove the anti-siphon valve(s)
from the system. Should the valves be come
clogged, clean and reinstall or replace.
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
care ful when attempting to operate the boat on
a mini mum amount of fuel. Though some fuel
may be in the tank, the rela tive trim angle of
the boat may cause the fuel to flow away from
the withdrawal.
NOTICE
On all Vista models, access to the anti-siphon
®
valve and fuel sender is by either an access
plate or through the engine compartment.
Owner's Manual Page 84