To provide a kerosene engine driving and working device capable of simplifying, quickening and facilitating a starting work of an engine.

This device is provided with a gasoline tank 3, a float chamber 6 of a carburetor, a pump 8, a kerosene tank 27 and a boost controller 31 selectively supplying gasoline and kerosene to the float chamber 6. In this case, the pump 8 is constituted of a casing 9 partitioned by communicating a valve chamber 12 and a suction chamber 13, a check valve 18 in which a ball 15 opens a spherical seat 16 due to inflow of kerosene into the valve chamber 12 and a piston 19 supplying kerosene to the kerosene tank 27 from the suction chamber 13 at the time of an advancing. The boost controller 31 is constituted of a case 32 and a plunger 34 which outflows gasoline from the gasoline tank 3 to the float chamber 6 when non-negative pressure of the carburetor is generated and retreats when negative pressure of the carburetor is generated and outflows kerosene from the kerosene tank 27 to the float chamber 6.