Abstract: A primary fuel-air mixture is dispersed into an airstream flowing through a venturi to achieve a desired final fuel-air mixture. The flow of air through the venturi is operatively controlled by a throttle valve means which includes a tube member having a fuel dispersing end positioned generally within a constricted portion of the venturi. Movement of the throttle tube selectively positions the fuel dispersing end in a spaced apart relationship with the constructed portion of the venturi and regulates the quantity of fuel and air flowing into an engine. The primary fuel-air mixture is supplied to a hollow interior portion of the throttle tube, and is dispersed uniformly from the fuel dispersing end of the throttle tube into the airstream. The quantity of primary fuel-air mixture dispersed is related to the quantity of air flowing through the venturi.