Hunter H31 Operator'S Manual Download

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Fuel leaking from any part of the fuel system can

lead to fire and explosion that can cause serious

bodily injury or death. Inspect system before

fueling.

Using the wrong type of fuel will result in severe

damage to the engines. Refer to your owner’s

manual for fuel recommendations.

Leaking fuel is a fire and explosion hazard.

Personal injury or death could occur.

5.1.3 Fuel Tank Fill & Vent

The fuel tank fill fitting is located on the port. side on the
stern. The fuel tank also has a hull vent fitting. This fitting
is also located on the port. side near the fuel fill. You can
see the fill in detail in Fig. 5.2, on page 5.3.

The fuel tank vent serves as a pressure / vacuum release
and a safety overflow. The vent is a thru hull fitting
with a flame arrestor, so it is imperative that you keep
the screens clear and in excellent repair. Replace the
screen immediately if it becomes damaged or displaced.
Periodically check the vent to see that it is not clogged.

The fuel fill and fuel vent hoses, fittings, and connec-
tions should be inspected for leaks and signs of dry rot
or swelling at least once a year. If any of these condi-
tions are present, have an authorized service technician
inspect the fuel system immediately. If a leak is found,
turn off battery switches, disconnect shore power, and
disable any possible source of ignition. Contact your
dealer or Customer Service immediately.

The use of any hose other than the USCG Type A1

or A2 could result in fuel leakage. Leaking fuel is a

fire and explosion hazard. Personal injury or death

could result.

5.2 Fuel Supply Lines and Hoses

If any fuel fill or vent hose's are in need of replacement,
ensure that only USCG Type A1 or A2 are used. The
engine has a fuel supply hose that runs from the pickup
tube in the fuel tank to the fuel water separator (com-
monly referred to as the fuel filter), then from the filter
to the engine. Also, the engine has a fuel return hose
that runs from the engine back to the fuel tank. The fuel
supply lines or hoses, fitting, and connections should be
inspected often for leaks and signs of wear, dry rot, chaf-
ing, or swelling. A good way to inspect the fuel hoses is
to run your hand along the length of the hose including
the fittings. Leaks will be revealed as wet spots on your
hand. If any evidence of hose deterioration is present,
have a qualified technician replace all the hoses with
USCG Type A1 hoses immediately!

In Fig.5.3 you can see the fuel supply fittings. The photo
inset shows the close-up of the fuel valve. See Fig.5.5
for the function of the fuel valves.

Note: If a leak is found, turn off battery switches, disconnect
shore power, and disable any source of ignition. Do not start
your engine, or any devices that could create a spark. Contact
your dealer or our Customer Service Department immediately!
If hoses need to be replaced, make sure only USCG Type A1
are used.

5.3 Fuel Valves

Your boat has fuel shutoff valves located at the tank in the
supply line route. These valves are used to start or stop
the flow of fuel through the supply lines.

Note: Even if the fuel supply valves are closed, there may be
fuel in the supply lines to the filters and engines ). Disconnecting

Hunter 31 • Fuel Systems

5.4

Fig. 5.3