The invention relates to fuel feed devices for internal combustion engines, of the kind comprising at least one fuel valve openable by an electromagnet for as long as the same is energized under the control of a signal delivered by an energizing system brought into operation simultaneously with the engine ignition system and adapted to transmit, in synchronism with the rotation of a rotating member drivable after the bringing into action of the engine ignition system, signals whose duration depends upon engine operating conditions. The energizing system comprises means which interrupt transmission of the signal and close the valve when the duration of the signal reaches a predetermined maximum value.