Abstract: A fuel tank cap provides a safety valve mounted on a tubular vent stem for venting fluids from a fuel tank. The safety valve is adapted for engagement with the tubular vent stem so that the fluids may enter the safety valve. A pair of upper cavities communicate with the vent stem through small channels offset therefrom. The upper cavities contain valve balls seated by gravity against valve seats for restricting fluid flow from the vent stem into the upper cavities. One upper cavity provides a biasing spring seating its valve ball against the its valve seat. The upper cavities provide restrictors positioned for limiting movement of the valve balls away from their valve seats, and a cover sealingly engaged with the safety valve to form a small chamber. The upper valve body further provides exit channels for conducting the fluids to exit.

Abstract: A fuel tank cap provides a safety valve mounted on a tubular vent stem for venting fluids from a fuel tank. The safety valve is adapted for engagement with the tubular vent stein so that the fluids may enter the safety valve. A pair of upper cavities communicate with the vent stem through small channels offset therefrom. The upper cavities contain valve balls seated by gravity against valve seats for restricting fluid flow from the vent stem into the upper cavities. One upper cavity provides a biasing spring seating its valve ball against the its valve seat. The upper cavities provide restrictors positioned for limiting movement of the valve balls away from their valve seats, and a cover sealingly engaged with the safety valve to form a small chamber. The upper valve body further provides exit channels for conducting the fluids to exit.