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8.
CARBURETOR
8-1
OPERATION
and
CONSTRUCTION
(See
figs.
49
and
50.)
8-
1
-
1
FLOAT
SYSTEM
The float chamber is located just below the carburetor body and, with a float and
a
needle valve, maintains a
constant fuel level during engine operation.
The fueI
flows
from the fuel tank into the float chamber through needle valve. When the fuel rises to a speci-
fic level, the float rises; and when
its
buoyancy and fuel pressure are balanced, the needle valve closes
to
shut
off the fuel, thereby keeping the fuel at the reference level.
By-path
Holes
Choke Valve Pilot Jet
Throttle Valve
Pilot
Outlet
Fuel Bowl
\
Fig.
49
Main Nozzle
-
Main
Air
Jet
Float
Main
Jet
Fig
50
-
33
-