21
Fuel Vent Fitting - Typical
Currently, domestic EPA
compliant fuel tanks vent
fumes back into the fuel
tank system. While the
tank is filled, air displaced
by the incoming fuel is
vented through the fuel
system charcoal canister.
Your vessel uses a combo type (internal vented)
fuel fill. Both the fuel fill and vent occupy the same
cavity under a protective cover. If fuel overflows
through the vent the design forces it back into the
fuel fill hose and tank. Be sure to tighten the fuel
fill cap to prevent water and debris from entering
the fill system.
A seasoned skipper will hear a distinct sound
as the tank nears the “top out” or full mode and
may see fuel overflowing back into the fuel hose
through the vent hole in the fill fitting. On select
vessels not using an EPA fuel system there may be
a separate vent fitting on the hull side. Periodically
check this vent screen for debris and insect activity.
Anti-Siphon Valve
The gasoline fuel
tank feed line that
runs from the fuel
tank to an engine
fuel component uses
an anti-siphon valve.
The valve is threaded into the fuel tank fitting at
the feed line. The valve is pulled off its seat by
fuel pump pressure as the engine is cranking or
running. There is a ball and spring assembly inside
the valve that is activated by fuel pump impulses.
It allows a one-way fuel roadway to the engine
or generator fuel system. It prevents fuel from
siphoning out of the tank in the event of a fuel
line rupture or damaged fuel feed hose. When the
engine fuel components stop the fuel from cycling
the spring forces the ball against the valve opening
to prohibit fuel flow.
Never remove an anti-siphon valve as it is a fuel
system safety component. Also, never remove
the ball and spring from the valve assembly. The
anti-siphon valve requires no normal maintenance.
Symptoms indicating possible valve problems may
be fuel starvation at intermediate or high rpm or in
extreme cases an engine that will not start.
Contact your Regal dealer for further information.
COMBO FUEL FILL/
INTERNAL VENT
INTERNAL BALL/SPRING
DO NOT OVERFILL THE FUEL TANK!
THIS HELPS AVOID ANY OVERBOARD
SPILLS WHICH MAY HARM THE
ENVIRONMENT!
NOTICE
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