Patent ID: 8231110

Claim:
A carburetor and roll-over valve comprising: a carburetor having at least one float bowl containing fuel; a cylindrical vertical vent tube extending upward from the carburetor and in fluid communication with the respective at least one float bowl; a roll-over valve fixed to the vent tube, the roll-over valve comprising: a compression fitting for forming a seal to the vent tube; a vertical centered passage though the roll-over valve; an inside shoulder forming a narrowing of the vertical centered passage; a vertically sliding obstruction residing inside the vertical centered passage and residing above the inside shoulder; bypass cuts in the vertical centered passage allowing air to flow past the vertically sliding obstruction into and out of the float bowl to equalize pressure in the float bowl with ambient air pressure when the carburetor is upright; a port above the vertical centered passage in communication with ambient air; and a narrowing between the vertical centered passage and the port to block passage of the vertically sliding obstruction into the port and to cooperate with the vertically sliding obstruction to restrict an escape of fuel from the float bowl when the carburetor is inverted.