Fuel Cock - Suzuki GS1100G 1982 Service Manual

FUEL AND LUBRICATION
SYSTEM 5-2
FUEL COCK
When the engine is not running and the valve is the
ON or RES position, the fuel valve is kept in the
closed position by applying
pressure utilizing a
spring s o that no fuel will flow to the carburetors.
When the engine is started, a negative pressure is
generated in the diaphragm chamber "C" through
the vacuum (negative pressure) pipe which is con-
nected to the No. 2 carburetor, and builds up a
"RES"
negative pressure which i s higher than the spring
pressure so that the diaphragm is forced to open
the fuel
valve and thus allow the fuel to flow to the
carburetors.
"ON"
, " -
P
Fuel valve
~2,;
O-ring
: $
Diaphragm
@
Spring
I$
One
way
valve
@?
Vacuum
@
Fuel flow
When the lever is set
to
PRI position, the protru-
sion
$ )
located on the
lever
end pushes back the
fuel valve mechanically against the spring force
and
it allows fuel to flow to the carburetors directly,
whether the
engine
is running or not, through the
RES side fuel filter and fuel valve clearance,
"PRI"