Abstract: An electronic engine control system for use with differing fuel types, such as gasoline, methanol and mixtures of the two, controls engine operating parameters such as the fuel/air ratio and ignition timing in response to fuel-type indications generated by a fuel type sensor positioned on the fuel line. Changes in the fuel type passing the sensor result in variations in the engine control signals which are effective after a variable delay period elapses. The duration of the variable delay period is altered in response to changes in fuel pump voltage and fuel temperature to form a better estimate of the transport delay experienced by the fuel as it passed from the fuel-type sensor to the engine's fuel intake. A microcontroller delays the control signal changes by retrieving a count value from a two-dimensional lookup table indexed by values reflecting pump voltage and fuel temperature.