Abstract: A device for mounting on the inlet manifold of an internal combustion engine for carbureting liquid fuel. A chamber is provided for receiving the liquid fuel. An ultrasonic generator is positioned in the chamber and is in direct communcation with the liquid fuel in the chamber. The ultrasonic generator acts to ultrasonically vaporize the fuel in the chamber, preferably by an electronic control system. The receiving chamber is interconnected to a gasified fuel storage chamber which acts to store a quantity of vaporized liquid fuel. The storage chamber and the receiving chamber are interconnected for passing vaporized liquid fuel from the receiving chamber to the storage chamber.