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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
"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
Fuel Systems - Section I
registers "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
I.
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.
J. Gas Vapor Detector
A gas vapor detector may be available on certain
models. If equipped, the gas vapor detector will moni-
tor the engine compartment and notify the operator
of an accumula tion of gasoline vapo rs. The operator
must take immediate action upon warning to avoid the
possibili ty of an explo sion.
The sensing unit is usually mounted towards the rear
of the engine compartment. The alarm unit is mounted
at the dash.
Always personally inspect the engine compart-
ment and sniff for fuel vapors before starting
the engine. Remember, a gas vapor detector is
a mechan i cal de vice. DO NOT rely exclusively
on its operation.
Owner's Manual Page 111
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