Abstract: A liquid fuel supply for an internal combustion engine wherein the fuel is circulated in a closed circuit including a fuel reservoir and a fuel metering device, delivering the fuel from the metering device to the engine by admitting compressed air to the metering device, the compressed air being supplied by a compressor that draws air and fuel vapor from the fuel reservoir. The residual gas in the metering device being entrained in the circulating fuel and returned to the fuel reservoir.

Abstract: A method and apparatus for delivering metered quantities of liquid wherein the liquid is circulated through a chamber to fill the chamber with liquid and circulation is temporarily terminated with the chamber filled with liquid. While circulation is terminated gas under pressure is admitted to the chamber to displace liquid therefrom through a discharge port. The quantity of liquid displaced is controlled by regulating the volume of the chamber and/or by regulating the relative disposition in the chamber of the point of entry of the gas and point of discharge of the liquid.

Abstract: An orbital engine has a piston member journalled on a shaft within a housing to orbit therein upon rotation of the shaft. A plurality of vanes form with the housing and piston member a plurality of variable volume chambers. An annular sealing member is mounted in a recess in a radial face of the piston member and engages an opposed radial face of the housing to form a seal therebetween. The sealing member has a radial face engaging the radial face of the housing and a non-radial face engaging a wall of the recess in the piston and a resilient member urging the radial and non-radial faces of the sealing member into sealing engagement with the housing and piston member.