Abstract: A bi-fuel and dual-fuel engine variable pressure fuel system is presented facilitating individual or simultaneous use of liquid and gaseous fuels including natural gas, hydrogen and gasoline, through employment of a variable output pressure gaseous fuel regulator incorporating an attached hydraulic amplifying structure communicating with a relatively low pressure fluid servo circuit that may in turn communicate with a variable pressure automotive liquid fuel system to facilitate relatively high pressure gaseous fuel injection.

Abstract: A bi-fuel and dual-fuel engine variable pressure fuel system is presented facilitating individual or simultaneous use of liquid and gaseous fuels including natural gas, hydrogen and gasoline, through employment of a variable output pressure gaseous fuel regulator incorporating an attached hydraulic amplifying structure communicating with a relatively low pressure fluid servo circuit that may in turn communicate with a variable pressure automotive liquid fuel system to facilitate relatively high pressure gaseous fuel injection.

Abstract: A fuel injection and precombustion chamber arrangement for internal combustion engines comprising a pair of concentric poppet valves. The outermost valve is arranged to open and close the precombustion chamber to the internal combustion engine cylinder. The innermost valve is arranged to open and close a chamber, formed in the outermost valve body, to the cylinder and to place a fuel-filled annular groove on the spool of the innermost valve in communication with the precombustion chamber and the chamber in the outermost valve such as to mix air flowing through the chamber of the outermost valve from the cylinder fuel and inject into the precombustion chamber the fuel contained in the annular groove in an atomized state.