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12-5 CABURETOR
12-5-1 FUNCTION
and
COMPONENTS (See
Fig. 12-28)
1) Float system
The
float chamber is located direct& under the carburetor. Flat and needle valves. maintain a constant
id
level
inside the float chamber.
The fuel in the tank tlo\vs into the float chamber from the needle valve. When a certain quantity of fuel enters the
chamber. the float rises. When the buoyax)-
oi
the flat \-alve balances with the fuel in-flow pressure of the needle
valves. the valves close to keep the fuel at the correct level.
Schematic diagram of the fuel system
CHOKE -
BY PASS;
THROTTLE
r VALVE
,-PILOT OUTLET
PILOT AIR JET
PILOT JETJ’
MAIN AIR JET?
FLOAT
L-d
.“.- MAIN NEEDLE
/.-NEEDLE VALVE
FLOAT i ‘MAIN JET
Fig. 72-28
-48-