6
Chapter 4
CARBON CANISTER
T h e d o m e s t i c E PA
compliant fuel tank system
contains a carbon canister.
It is located at the starboard
firewall bulkhead area in
the engine room (bilge or
sump). Ii’s environmental
mission is to catch and
fi lter any contaminents that
are attempting to exit the
fuel system via the fuel tank
vent hose. This component
should last the life of the
fuel system and requires no periodic maintenance other
than checking the hose clamps for tightness.
GASOLINE VENTILATION SYSTEM
Gasoline propelled engines require a continuous supply
of fresh air in order to generate peak horsepower and
rpm. To deliver fresh air for the twin engines a dual set of
permanently mounted vents are integrated into the boat’s
deck on both port and starboard sides. This is called the
natural ventilation system.
When the engines are started fresh air is drawn through
the vent system. As the demand for air increases in rela-
tionship to the engine revolutions per minute (rpm’s) the
engine induction system supplies the required additional
air supply by inhaling more air.
As part of
the gasoline
c o m b u s t i o n
process fuel
vapors can ac-
cumulate in
the bilge and
cause a pos-
sible explo-
sion or fi re. To
offset the pos-
sibility of this
happening a
powered venti-
lation system exits fuel vapors and possible CO through a
system of blowers with hoses that are stragedically placed
in the lower third of the engine compartment. Gasoline
vapors naturally seek the bilge bottom and the blowers
evacuate any fuel vapors out the exhaust side of the ven-
tilation system. This is known as the powered ventila-
tion system. If you are working in the sump make sure
you do not step on the black 4” blower hoses.
Check the vents periodically for any obstructions or for-
eign objects such as nests or spider webs. If the propul-
sion system is running at a lower than normal cruising
rpm or seems to lack power or the vessel is slow to plane
check the fresh air supply to the engines including the
engine air fi lters.
Note that proper amounts of natrual ventilation is even
more important with diesel installations.
BLOWER
BLOWER
HOSES
To Next Page
Loading...
