Saturated cryogenic fuel system

Abstract

A cryogenic fuel system for an internal combustion engine utilizing both the liquid and vapor of a saturated liquid fuel comprising an insulated storage tank having inner and outer walls a vapor tube passing through the walls of the tank with its open end positioned approximate the top of the tank above the liquid level and its opposite end connected to the engine; a liquid entry and exit tube passing through the walls of the tank with a portion of the tube at or above the open end of the vapor tube, the liquid tube extending downwardly to the bottom portion of the tank to its open end; a first pressure-actuated valve means positioned in the vapor tube having an open or closed position which opens the vapor tube to the engine when the tank pressure exceeds a predetermined pressure; and a second valve means in the liquid tube having an open and closed position which opens the liquid tube to the engine when the engine is running.

Dependencies are inferred from the claim text.