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Chapter 5:
Fuel System
5.1 General
The Gasoline fuel system used in Scout boats is
designed to meet or exceed the emission control
standards of the Environmental Protection Agency
(EPA) and the requirements of the U.S. Coast
Guard, the Boating Industry Association and the
American Boat and Yacht Council in effect at the
time of manufacture.
All gasoline fuel systems have been factory in-
spected and pressure tested in accordance with
regulations in effect at the time of manufacture.
This inspection assures that the system is air tight,
leak proof and safe. It is the responsibility of the
purchaser to maintain it in that condition. Make
frequent inspections to assure that no deteriora-
tion or loosening of connections is resulting from
vibration.
DANGER
DO NOT LET THE ODOR OF GASOLINE GO UNCHECKED. ANY
ODOR OF GASOLINE MUST BE IMMEDIATELY INVESTIGATED
AND STEPS TAKEN TO PROTECT THE BOAT AND ITS
OCCUPANTS UNTIL THE PROBLEM IS CORRECTED. IF THE
ODOR OF GASOLINE IS NOTED, SHUT OFF ALL ENGINES
AND ELECTRICAL EQUIPMENT. INVESTIGATE AND CORRECT
THE SITUATION IMMEDIATELY. HAVE ALL PASSENGERS
PUT ON PERSONAL FLOTATION DEVICES AND KEEP A FIRE
EXTINGUISHER READY UNTIL THE SITUATION IS RESOLVED.
Fuel Withdrawal Tubes
The fuel withdrawal tubes are positioned in the
fuel tanks to achieve optimum fuel usage, fuel line
routing, etc. At certain speeds and hull trim angles,
the fuel supply at the withdrawal tank location can
increase or decrease accordingly. Be extremely
careful when attempting to operate the boat when
low on fuel. Though some fuel may be in the tank,
the relative trim angle of the boat may cause the
fuel to flow away from the withdrawals.
Fuel Gauges
Indicate the amount of fuel in the tanks. Due to the
mechanical nature of the fuel senders, 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.
Typical Hinged Fuel Fill
Fuel Fills
The fuel tanks are vented through the fill fitting
and cap. The system is equipped with three “key
-
less” fuel caps located on each side gunnel that
are marked “GAS.” The fuel fill caps are designed
to seal out water and allow the fuel tank to vent
to the atmosphere when the cap is closed.
To comply with EPA emission requirements, your
boat could be equipped with spring loaded, hinged
fuel fill caps with a push button release system
or threaded, ratcheting twist off caps that click
when they are tightened to indicate the cap is
properly closed.
Hinged Fuel Fill Caps
Hinged fuel fills are opened by pressing the release
button on the side of the cap and flipping the cap
open. After fueling, make sure to close and press
down firmly on the cap until it latches.
Fuel Tank Vent
Each fuel tank is equipped with a fuel tank vent
system incorporated into each fuel fill. The fuel
fill cap is designed to seal out water and allow the
fuel tank to vent to the atmosphere when the cap
is closed.
While the tank is being filled, air displaced by
the fuel escapes through the vent and fuel fill.
When the tank is full, special valves incorporated
in the vent and fill hoses close and activate the
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