Abstract: A double carburetor including a primary suction conduit and a secondary suction conduit located in a suction passage of an internal combustion engine equipped with a turbosupercharger for supplying supercharged air to a combustion chamber by means of a compressor driven by a turbine rotated by the energy of exhausts has an air-fuel ratio correcting control valve for a primary main fuel system of the primary suction conduit and another air-fuel ratio correcting control valve for a secondary main fuel system of the secondary suction conduit. The carburetor also has a drive unit which is operative, when the turbosupercharger is put into action, to actuate the air-fuel ratio correcting control valves for the primary and secondary main fuel systems to correct the air-fuel ratio of fuel-air mixtures supplied to the engine by increasing fuel flow or decreasing air flow therethrough.

Abstract: A carburetor with a fuel compensation device have an exhaust gas recirculation passage with an exhaust gas recirculation valve, as that an exhaust gas from an engine may flow into a suction passage through the exhaust recirculation passage. The exhaust gas recirculation valve comprises a diaphragm, and controls the exhaust gas flow recirculating in response to vacuum during the recirculation of the exhaust gas. The vacuum is taken in from a vacuum intake port defined in the suction passage, the position of which is disposed slightly upstream of the position of a throttle valve at which idling of the engine is effected. At the same position as that of the vacuum intake port with respect to the fluid flow direction in the suction passage, there defined is an auxiary fuel jet port communicating with a float chamber, so that fuel is jetted into the suction passage corresponding to the quantity of the exhaust gas recirculating.