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FUEL SYSTEM
How The Carburetor Works
2000 FE290 Gasoline Vehicle Maintenance and Service Supplement Page 14-3
14
from the carburetor float chamber. The combustible mixture of air and fuel is then delivered into the venturi
through the pilot outlet and bypass. When the engine is operating at low speed, fuel is supplied mainly
through the pilot outlet (Figure 14-3, Page 14-3).
The air/fuel mixture is adjusted by the pilot screw (needle valve) (Figure 14-3, Page 14-3).
Figure 14-3 Carburetor
AIR
FUEL
AIR / FUEL MIXTURE
BYPASS HOLES
PILOT AIR JET
MAIN AIR PASSAGE
MAIN AIR PASSAGE
INTAKE
AIR
MAIN AIR JET
MAIN NOZZLE
THROTTLE VALVE
PILOT OUTLET
CARBURETOR BORE
TO ENGINE
PILOT AIR SCREW
PILOT JET
THROTTLE VALVE
CARBURETOR BORE
TO ENGINE
MAIN AIR JET
TOP VIEW
SIDE VIEW
INTAKE
AIR
FLOAT
BLEED PIPE
MAIN JET
MAIN NOZZLE
FLOAT CHAMBER
FUEL INLET
FUEL INLET
FUEL
MIXTURE
TO
CYLINDER
MIXTURE
TO
CYLINDER
MIXTURE
TO
CYLINDER
FUEL