Anti-Syphon Valve; Fuel Gauge; Fuel Sender - Four winns V Series Owner's Manual

Figure I8: P-trap Fuel Vent
(Representative View - Models May Vary)
When it comes to maintenance of the fuel vent the
manufacturer has provided the following information
and maintenance instructions.
You will know the vent needs maintenance if vapor
rushes into or out of fuel tank when you open deck fill
cap. You may also notice difficulty while fueling (back-
splash or pump shutting off continuously during fill).
Debris and spider webs can block the vent, especially
after storage. Use these steps to clean vent screen
before and after storage, or at least once a year.
This maintenance should be done while the boat is
out of the water. This way you do not risk losing parts.
1. Use a 3/16" (5mm) hex wrench to turn cap off
counter-clockwise. Set cap aside for re-installation
2. When cleaning, DO NOT allow debris to fall down
the vent tube into tank.
3. Remove screen and clean with solvent or air
pressure. Be sure not to puncture the screen.
4. Replace screen in original position. 5. Replace
and tighten vent cap (30-to-35 in./lb. torque, 3.39
to 3.95N.Meters). Do not over-tighten.
F. Anti-Syphon Valve
The fuel withdrawal line is equipped with an anti- syphon
valve where the line attaches to the fuel tank. This valve
prevents gasoline from syphoning out of the fuel tank
should a line rupture. See Figure I9 for anti-syphon
location.
Fuel Systems - Section I
Figure I9: Fuel Tank Fittings
(Domestic Model Shown)
The fuel withdrawals are positioned in the fuel
tanks to achieve optimum fuel usage, and fuel
line routing. At certain speeds and hull trim
angles, the fuel supply at the withdrawal tank
location can increase or decrease accordingly.
Be extremely care ful when attempting to op-
erate the boat on a minimum 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 with drawal.
Access plates or lids are provided in the floor for
easier access to the fuel pick-up, anti-syphon
valve and send er.
G. Fuel Gauge
The fuel gauge indicates the amount of fuel in the
tank. See Section E-8F - Fuel Gauge for addition al
information on fuel gauge use.
H. Fuel Sender
The fuel sender consists of a float which travels up
and down a stationary tube. The float measures the
level of the fuel in the tank and sends a signal to the
fuel gauge. See Figure I10.

Anti-Syphon Valve

NOTICE
Owner's Manual Page 110