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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.
NOTICE
Access plates or lids are provided in the floor for
easier access to the fuel pick-up, anti-syphon
valve and send er.
H. Fuel Gauge
The fuel gauge indicates the amount of fuel in the
tank. See Section E-7F - Fuel Gauge for addition al
information on fuel gauge use.
I.
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.
Figure I10: Fuel Sender Operation
Due to the mechanical nature of the fuel sender, varia-
tions in readings during various speeds of operation
may occur. This system is merely a relative indication
of the avail able fuel supply and not a calibrated
instru ment. With this type of sending unit a more accu-
rate 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 I10. When boating, the trim angle of
the boat changes and affects the gauge readings.
Under these conditions, the fuel sender will register
Fuel Systems - Section I
"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
I11.
Figure I11: 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 prob-
lems with running out of fuel on the water.
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 m ined. Because
of boating conditions, speed, weight and other factors
common to your situa tion, fuel consumption will vary
between your boat and consumption figures devel-
oped by Four Winns.
When the fuel gauge begins to register below the
"Full" mark, the gauge readings will drop much faster
until it reads" empty". When this occurs, the trim angle
has affected the sender reading. When the gauge reg-
isters "empty", the sender has bot t omed out and there
may be 3 to 4 gal lons of fuel in the tank.
See Figure I12.
Figure I12: Trim Angle Effect with Low Fuel
J. Fuel Filters
Fuel filters are installed on each engine. Filters should
be changed frequently to assure an ade quate supply
of fuel to the engine. Refer to the engine manual for
additional infor ma tion. The engine manual is included
in the owner's information packet.
NOTICE
Canister-type filters should be changed annually.
Owner's Manual Page 81
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