Fuel is admitted through pipe 1 to float chamber 2 containing float 3, which operates needle valve 4. From the float chamber, fuel is delivered through jet 5 into venturi 7 where it mixes with air under pressure admitted through jet 6. A part of the fuel is delivered through ball valve 8 into chamber 9 of the accelerating pump. When throttle valve 10, turning about fixed axis A, is opened, lever 11 turns downward. Piston 12 of the accelerating pump is also moved downward by spring 13. At this, valve 8 is closed and fuel from the pump is delivered through ball valve 14 and jet 15 into venturi 7. The accelerating pump is used to avoid leaning the fuel-air mixture when the throttle valve is opened.
$4251$CHP,Rg$