C. Anti-Syphon Valves
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 I-2 for
Figure I-3: Fuel Sender Operation
Due to the mechanical nature of the fuel sender,
variations in readings during various speeds of
operation may occur. This system is merely a relative
indication of the available fuel supply and not a
calibrated instrument. With this type of sending unit
a more accurate measurement of fuel level is obtained
with the boat in a level position.
The gauge readings will also vary with the trim angle
of the boat. When sitting at a dock and the boat is
nearly level, the fuel gauge will register accurately.
Refer to Figure I-3. When boating, the trim angle of
the boat changes and affects the gauge readings.
Under these conditions, the fuel sender will register
“full” for the ﬁrst few hours of running time until the fuel
level drops below the 3/4 or 1/2 mark. This is caused
by the angle of the fuel in the tank as shown in
Figure I-2: Fuel Tank Fittings
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 accord-
ingly. Be extremely careful when attempting to
operate 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 withdrawal.
Figure I-4: Effects of Trim Angle
It is very important to keep track of hours and fuel
consumption to obtain an average gallon per hour
consumption ﬁgure. Refer to the fuel log located at
the back of this manual. This will help to prevent any
problems with running out of fuel on the water.
Access plates or lids are provided in the ﬂoor
for easier access to the fuel pick-up, anti-sy-
phon valve and sender.
Dealers are equipped with some general ﬁgures on
consumption which can be used as a guide until spe-
ciﬁc information on your boat is deter mined. Because
of boating conditions, speed, weight and other factors
common to your situation, fuel consumption will vary
between your boat and consumption ﬁgures devel-
oped by Four Winns.
D. Fuel Gauge
The fuel gauge indicates the amount of fuel in the
tank. See Section E-6F - Fuel Gauge (4-in-1-Gauge)
for additional information on fuel gauge use.
E. Fuel Senders
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 I-3.
Fuel Systems - Section I
Owner’s Manual Page 73
|Categories||Four Winns F-Series Manuals, Four Winns Manuals|
|Tags||Four Winns F|
|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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