PURPOSE: To permit actuation of an engine by alcohol fuel by reacting pilot fuel of ether with air in a combustion chamber, and compressing it to be ignited to raise the temperature of fuel-mixed gas in it for compressing injected main fuel and starting combustion.

CONSTITUTION: A quantity controlling pump 5 feeds a specified quantity of oil from an oil supply tank 6 to the suction side of a methanol supply pump 3 to be mixed with methanol supplied from a methanol supply tank 4 to an injector pump 2. A large quantity of methanol is introduced from the tank 4 through a bypass fuel line 7 to a pilot fuel pump 8. Methanol is introduced from the pump 8 through an exit line 9 to a converter device 10, where inflow methanol is converted into dimetyl ether having a larger combustible range than methanol fuel, and this is introduced through a line 15 to an air introducing device of an engine 1, that is a manifold.