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Fuel system components must be compatible with oxygenate
(butanes,
alcohols) blended fuels.--pailure to ensure compatibility will result
in the component failure and possible injury to the user.
The use of check valves in place of the solenoid-type shut-off valves
is discouraged.
Check valves may tax the ability of the fuel lift
pump on the eng ine to draw fuel through them.
Also,
they can trap
debris under their seats, defeating their purpose.
Too high a crack-
ing pressure for check valves will contribute to vapor lock shutdowns.
Cooling System
The generator engine is fresh water-cooled by an engine-mounted heat
exchanger.
Sea water is used as the exchange cooling medium and is
pumped into the exchanger by a sea water pump and then injected into
the
exhaust discharge,
carrying
with
it
the
heat
removed
from
the
engine fresh water system.
The
sea water
pump
is
belt-driven
and sea water should be supplied to
it
through
a
flush-type
hull
fit-
ting.
This
sea
water
should
be
brought
through
a
visual-type
sea
water strainer and then delivered to
the
pump.
Hoses
routed
from
the
thru-hull
fitting
to
the
strainer
and to
the sea water pump, should
be
wire-reinforced
to
prevent
collapse from the suction of the sea
water
pump during
generator
opera-
tion.
Sea water strainers should be
mounted at or below the water line
so as to be always self-primed.
CAUTION
Do
not
use
a
scoop-type
thru-
hull
fitting
for
the sea water
supply to the generator.
Water
pressure
against
this
type
fitting,
while
the
vessel
is
underway,
can
push
water
past
the sea water pump impeller and in to
Belt Tension
3/8-1/2 Inch
Deflection at
Longest Span
the generator exhaust system, filling it and the engine as well.
Flush-type, clear,
thru-hull fittings are recommended and should
be located on the hull so as to be below the waterline during all
angles of boat operation.
The
use
of
common-type
street
elbows
is
not
recommended
for
plumbing
the
sea
water
circuit.
These generally
have
a
very
restrictive
inside
diameter.
Machined
fittings
are
preferred.
12
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