Electronic fuel injection module

A small air-cooled engine, comprising:

• a cylinder including a cylinder head and cylinder intake port;
• a piston configured to reciprocate within the cylinder;
• a crankshaft configured to rotate in response to reciprocation of the piston;
• a fuel tank configured to store a liquid fuel;
• an air cleaner configured to filter air for combustion;
• an electronic fuel injection module, comprising:
• a throttle body, comprising:
• a throat extending between an inlet port and an outlet port, wherein the inlet port is fluidly coupled to the air cleaner to receive filtered air;
• and
• a fuel delivery injector unit, comprising:
• a cavity extending along a central longitudinal axis;
• a fuel inlet configured to receive fuel and fluidly coupled to the cavity to direct fuel into the cavity;
• a magnetic assembly including a magnet, a pole, and a hollow sleeve, wherein the magnet and the pole are secured to the sleeve, and wherein the magnetic assembly is fixedly positioned within the cavity;
• a pumping assembly including a bobbin and a piston, wherein the bobbin includes a coil configured to be coupled to an electrical power supply, wherein the bobbin is configured to move the pumping assembly within the cavity in response to interaction between a magnetic field created by energizing the coil and the magnetic assembly, and wherein the piston is coupled to the bobbin and configured to move within the sleeve;
• a spring coupled to the pumping assembly to bias the pumping assembly to a home position;
• a valve seat located at one end of the piston;
• a valve configured to selectively engage the valve seat in response to movement of the piston within the sleeve, wherein the valve allows fuel to flow into a pressure chamber when open and prevent fuel flow into the pressure chamber when closed;
• and
• an out valve positioned between the pressure chamber and an outlet passage, wherein the out valve allows fuel to flow from the pressure chamber into the outlet passage when open and prevent fuel flow from the pressure chamber into the outlet passage when closed, wherein the fuel inlet is fluidly coupled to the fuel tank, wherein the fuel inlet is positioned below the fuel tank so that liquid fuel is delivered to the fuel inlet via gravity, wherein the fuel inlet is located near a bottom portion of the fuel delivery injector unit and the outlet passage is located near a top portion of the fuel delivery injector unit, and wherein the outlet passage is fluidly coupled to the throat to provide fuel to mix with the filtered air;
• wherein the outlet port is fluidly coupled to the cylinder intake port to provide a fuel-air mixture for combustion in the cylinder.