Fuel Vent; Filling The Tank; Fuel Distribution System - Boston Whaler Montauk 190 Owner's Manual

Section 3 • Systems & Components Overview & Operation
Fuel tank
Your boat is equipped with a low permeation crosslink
Polyethylene fuel tank with a usable fuel capacity of
60 gallon (227 L). The usable capacity of the fuel
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. 3.2.1). The VaporTec fuel pressure
management system, (fuel fill deck fitting, integrated
check valve, fill limit vent valve, grade valve), en-
sures 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 ar-
resting 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.

Filling The Tank

This fuel system is designed to automatically shut
WARNING
!
The fuel system on this vessel complies with
all applicable ABYC standards. Fueling station
pump flow rates that exceed 18 gallons
(68 liters) per minute may damage system
components and cause fuel leakage into the
vessel.
190 Montauk
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 shutoff system (Fuel Fill
Deck Fitting, Integrated Check Valve, Fill Limit Vent
Valve), guarantees the boater a clean trouble-free fill
up. Details such as 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.

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
siphon into the boat.
WARNING
!
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
components with unauthorized parts may result
in over-pressurization of the fuel system and
circumvent the safety features designed into
your tank.
NOTICE
Keep records of the fuel capacity and consumption
of your boat. Drastic changes in consumption and
mileage may indicate a problem.
R
3-3