Abstract: A fuel control device is adapted to be used in the place of the conventional pilot jet of the carburetor of an internal combustion engine. This device comprises a chamber defining first and second valve seats, as well as a double-acting movable valve member cooperating alternatively with said valve seats. The chamber is connected by the first valve seat to a fuel inlet, and by the second valve seat to an air inlet, and its wall has openings by means of which said chamber may be interposed in a low-pressure conduit connected to the carburetor. Means are provided for maintaining the valve head in an intermediate position, i.e.