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A universal fuel injection system for liquid and gaseous fuels and mixes thereof the universal fuel injection system having a universal fuel injection module interposed between a liquid fuel injector nozzle the universal fuel injection module having a spring-biased gaseous fuel valve connected to a

A universal fuel injection system for liquid and gaseous fuels and mixes thereof the universal fuel injection system having a universal fuel injection module interposed between a liquid fuel injector nozzle the universal fuel injection module having a spring-biased gaseous fuel valve connected to a pressurized gaseous fuel source and to a conical poppet mixing valve in the fuel injector nozzle where liquid fuel from the liquid fuel actuator unit and gaseous fuel selectively admitted through the spring-biased gaseous fuel valve mix for discharge through a fuel nozzle discharge orifice.

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1. In a fuel injector system having a liquid fuel injector with a liquid fuel actuator unit and an injector nozzle that injects fuel into an engine cylinder, a universal fuel injector system comprising:a universal fuel injection module interposed between the liquid fuel actuator unit and the injecto

1. In a fuel injector system having a liquid fuel injector with a liquid fuel actuator unit and an injector nozzle that injects fuel into an engine cylinder, a universal fuel injector system comprising:a universal fuel injection module interposed between the liquid fuel actuator unit and the injector nozzle, the injector module having a spring biased gaseous fuel valve with a displacement poppet and a conduit connection to a source of pressurized gaseous fuel, and a conical poppet mixing valve in the injector nozzle having a passage connected to the liquid fuel actuator unit and a passage connected to the gaseous fuel valve, and control means for selecting one of a liquid fuel from the liquid fuel actuator unit and a liquid-gaseous fuel in part from the liquid fuel actuator unit and in part from the gaseous fuel source through the spring biased gaseous fuel valve, wherein on selection of the liquid-gaseous fuel, a pilot liquid fuel pulse displaces the poppet of the gaseous fuel valve releasing a charge of gaseous fuel through the gaseous fuel passage to the poppet mixing valve where it mixes with the pilot liquid fuel pulse.