Secondary Fuel Premixing Controller for an Air Intake Manifold of a Combustion Engine

A method of introducing a secondary fuel into an intake manifold of a combustion engine which normally operates on a primary fuel source comprising the steps of:

• a. providing a secondary fuel premixing controller into an inlet air stream of a combustion engine, said controller including:
• a hollow housing having an air inlet, a main controller body, and an air/secondary fuel mixing outlet connected together in coaxial alignment one to another;
• said air inlet receiving air into said controller responsive to operation of the engine, said air/fuel mixing outlet discharging a blended mixture of secondary fuel and air into an air intake manifold of the engine;
• said main controller body including a secondary fuel manifold positioned centrally within an interior of said controller and supporting for axial movement an air pressure valve positioned proximate to said air inlet and being connected coaxially to a secondary fuel/air blender;
• said secondary fuel manifold also having a secondary fuel inlet formed therethrough connectable at an outer end thereof to a source of secondary fuel, an inner end of said secondary fuel inlet positioned for sealing engagement with said secondary fuel/air blender;
• said air pressure valve and said secondary fuel/air blender being cooperatively configured and biased to close and seal the inner end of said secondary fuel inlet when the engine is stopped and to open said inner end responsive to engine intake air intake through said controller when the engine is running.
• b. connecting said secondary fuel inlet to a secondary fuel source;
• c. operating the engine.