Abstract: An internal combustion engine that includes an engine block assembly, an air intake system coupled to the engine block assembly and an alternative fuel delivery system coupled to the air intake system. The alternative fuel delivery system includes a control module that monitors measurements of operational data of the internal combustion engine from the one or more sensors. In response to the operational data, the control module determines a fuel flow rate of alternative fuel and controls injection of the alternative fuel to provide the determined fuel flow rate of alternative fuel into the air intake system.