Fuel flow balancing apparatus

In a carburetor for an internal combusion engine, said carburetor having at least two air passageways through which air is drawn into the engine, at least one fuel circuit for each passageway through which fuel is drawn from a source thereof into said passageway and mixed with air passing therethrough to produce an air-fuel mixture combusted in said engine, the amount of fuel flowing through each fuel circuit being a function of the sub-atmospheric air pressure level to which each said fuel circuit is subjected, the improvement comprising:

• apparatus for balancing the fuel flow in said fuel circuits including means for sensing the pressure level in each fuel circuit, the pressure levels in said fuel circuits differing as a result of the flow characteristics thereof, means for introducing air into one of the fuel circuits to modulate the quantity of fuel flowing therethrough, and means responsive to the sensing means for controlling the amount of air introduced into said one fuel circuit as a function of the difference between the sensed pressure levels in said fuel circuits whereby the quantity of fuel drawn through said one fuel circuit is adjusted until it substantially equals the amount of fuel drawn through the other fuel circuit so the resulting air-fuel ratios of the mixtures produced in the respective air passageways are substantially equal.