Boston Whaler 270 VANTAGE, Manual, Page: 78 / 148

3-4
270 Vantage
Section 3 • Systems & Components Overview & Operation
R
siphon into the boat.
Filling The Tank
This fuel system is designed to automatically shut
off the fuel nozzle when the tank is full, similar to an
automotive fuel system. The tank is filled when the
fuel fill nozzle has shut itself off the second time. The
SecureStop automatic fuel shut off system (Fuel Fill
Deck Fitting, Integrated Check Valve, Fill Limit Vent
Valve), guarantees the boater a clean a trouble-free
fill -up. Details such as the valve design and deck
fill nozzle retention features ensure consistent fill-
up/shutoff. Attempting to fill the tank past this point
may cause some of the components to not function
properly, or malfunction.
tank is different from the tank capacity marked on
the tank from the manufacturer. The difference is the
non-usable portion of the tank which results from the
fuel in the tank that is below the pickup tube and the
ullage area that has been incorporated into your tank.
It is recommended that you follow all instructions
regarding the filling of fuel tanks.
Please take
time to read and understand all the fuel related
information and warnings regarding gasoline and
your boat, in the engine owner’s packet.
Fuel tanks with levels less than 1/4 full can cause
engine stalling problems due to fuel starvation or by
allowing sediment and dirt to enter the fuel supply
lines. Keep the tank full and monitor the fuel level
often to prevent this from happening.
Fuel Vent
The fuel tank vent is integrated into the fuel fill
deck fitting (see fig. 3.4.1). The VaporTec fuel
pressure management system, (fuel fill deck fitting,
integrated check valve, fill limit vent valve, grade
valve), ensures that the fuel system constantly
maintains proper vapor pressure in all situations.
This eliminates any unintended pressure which can
seriously damage a boat or engine. The vent serves
as an over pressure/vacuum release with anti-surge
and flame/spark arresting protection. The fuel vent
system also plays an important role in controlling the
“FULL” level of fuel with the use of the FLVV (Fill
Limit Vent Valve). Grade Valves have been added to
the tank which allows proper ventilation of the tank
when the boat is stored, or trailered, on a moderate
incline, without fuel seepage.
Fuel Distribution System
The fuel is delivered from the tank to the engine
through the Fuel Demand Valve (FDV), anti-siphon
valve, and the fuel line. The FDV prevents the built
up pressure inside the tank from being transferred
to the engine while still allowing fuel to flow as the
engine requires it for operation. The anti-siphon valve
is a safety feature designed to prevent the fuel from
siphoning out of the tank if the fuel line were to be
cut or broken below the level of the fuel in the tank.
In this case, some fuel would leak from the line, but
would not allow the entire contents of the tank to
REFER TO THE ENGINE MANUFACTURER’S MANUAL
IN YOUR OWNER’S MANUAL PACKET FOR COMPLETE
INSTRUCTIONS AND WARRANTY.
Keep records of the fuel capacity and consumption
of your boat. Drastic changes in consumption and
mileage may indicate a problem.
NOTICE
NOTICE
FUEL GAUGE only reads accurately when boat
is level (not underway).
The use of a portable fuel tank to fill your boat’s
tank can result in overfilling and circumvent the
safety features designed into your tank.
!
WARNING
The modification of any of the fuel system
components or the replacement of these com-
ponents with unauthorized parts may result
in over-pressurization of the fuel system and
circumvent the safety features designed into
your tank.
!
WARNING