Additive supply and control device

Claim 1

In combination with an engine operating on fuel/air mixture passing through a manifold in which a vacuum is developed, a device for supplying an additive from a source of supply, to the mixture in response to such vacuum comprising a container for such additive, a well body to receive additive from said container, a series of wells extending generally vertically in said body, one of said wells constituting an atmospheric well connected by an opening to receive additive at the lower portion of the container, the said well being open to the atmosphere at the upper end, a fluid lift well in the body, a passageway connecting the lower ends of the wells aforesaid, the lift well being connected by a fluid line to the said manifold, an orifice in the fluid line leading to the manifold, means to regulate the flow of additive from the lift well to the orifice, an evacuator well in the body, a passage connecting the evacuator well to the fluid lift well intermediate the regulating means and the orifice, a passageway extending from the evacuator well into the interior of the container, said passageway having an open end normally above additive in the container, said container being thereby evacuated above adequate additive therein by vacuum developed during operation of the engine, additive likewise being supplied to the manifold by such vacuum through the fluid lift well.