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to prevent contaminating the fuel vent and deck fill.
Cleaning with only mild soapy water is recommended.
D. Fuel Vents
On these models, the deck fill has an integrated vent
is installed. See Figures B32. While the tank is being
filled, the air displaced by the fuel es c apes through the
vent overboard.
E. Fuel Gauge
The fuel gauge indicates the amount of fuel in the
tank. See Section B-4D - Fuel Gauge for addition al
information.
F. 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 B35.
Figure B35: 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 B35. 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
B36.
Boat Systems - Section B
Figure B36: 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
specific information on your boat is deter m ined.
Because of boating conditions, speed, weight and
other factors common to your situa tion, fuel consump-
tion will vary between your boat and consumption
figures developed by Scarab.
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
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 B37.
Figure B37: Trim Angle Effect with Low Fuel
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
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 with drawal.
Owner's Manual Page 65
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