An electronic engine fuel controller that is simple, low cost, easily installed, and configurable for any internal combustion engine. The system is intended for upgrading older carbureted vehicles or vehicles that have been modified beyond the limits of the OEM controller. It takes advantage of modern micro controller technology with integrated memory, digital input/output, sensor and timer channels to produce a low parts count, as well as reliable operation in a large variety of vehicles, even when installed by people with little experience of knowledge in this area. Operation is by sensing a tachometer signal from the existing distributor, ignition coil, toothed wheel or similar device that produces one electronic pulse for each cylinder cycle. When a pulse is received, software in the micro measures engine operating parameters, calculates fuel parameters, and fires one or more injectors depending on how the system is configured. Configuration software operating on an external computer or laptop and communicating with the micro allows the user to modify any of the controller parameters or tables used for the fuel calculations.