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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 accurate
measurement of fuel level is obtained with the boat in
a level position.
The display readings will also vary with the trim angle
of the boat. When sitting at a dock and the boat is
nearly level, the fuel display will register accurately.
Refer to Figure I7. 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 I18.
Figure I18: 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. Note: The EVC display can be set
to show the fuel consumption rate. Use the fuel log
located at the back of this manual to assist in keeping
track of the fuel consumption rate. This will assist in
preventing 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
specific information on your boat is deter m ined. Be-
cause of boating conditions, speed, weight and other
factors common to your situa tion, fuel consumption
will vary between your boat and consumption figures
developed by Four Winns.
When the fuel begins to register below the "full"
mark, the display readings will drop much faster until
it reads" empty". When this occurs, the trim angle
has affected the sender reading. When the display
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 I19.
Fuel Systems - Section I
Figure I19: Trim Angle Effect with Low Fuel
G. 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
maintenance schedule as well as the procedure for
changing the fuel filter. The engine manual is included
in the owner's information packet.
DO NOT attempt installation or maintenance of
any fuel system equipment unless thoroughly
familiar with the sys tems and experi enced in
making such instal lations or maintenance. Only
qualified personnel should perform fuel system
maintenance.
H. Use and Maintenance
DO NOT let the odor of fuel go un checked.
If the odor of gasoline is noted, DO NOT
START ENGINE. If engine is running, SHUT
OFF EN GINE, ELEC TRI CAL AND HEAT
GEN ERATING EQUI P MENT. Investigate
and cor rect the situa tion imme diately! Have all
passen gers put on per sonal flotation de vices and
keep fire extin guishers at hand until the situation
is resolved.
Avoid serious injury or death from fire or ex-
plosion resulting from leaking fuel. Have fuel
system inspected for leaks, check conditions
of all rubber hoses and re-tighten hose clamps
every 200 hours or at least once a year by an
authorized service facility.
If areas are found within the fuel system that appear
questionable, have a qualified marine technician in-
spect the system. A thorough fuel sys tem examina tion
should be made by an experienced marine technician
at least once a year.
Owner's Manual Page 115
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