The invention relates generally to a device for supplying fuel from a reservoir to the internal combustion engine of a motor vehicle. In particular, this invention relates to a device of this kind having a fuel reserve container disposed in the reservoir, a fuel pumping unit aspirating from the reserve container and communicating on the compression side with the engine, a fuel return line from the engine to the reservoir, a jet pump communicating with the return line and disposed in the reservoir, a chamber formed by the housing of the reserve container and defining a plurality of portions, the jet pump protruding into the chamber to pump fuel into the reserve container, and one portion of the chamber being provided with an opening communicating with the reservoir.motor vehicle is characterized by the provision of an elongated chamber defining a succession of cylindrical portions extending along the bottom of the reserve container and above the bottom of the reservoir; the jet pump protruding into the first cylindrical portion; the opening in the second cylindrical portion having the form of an intake window located in the upper half of the second portion above the fuel jet streaming from the jet pump, thus creating in the lower half of the chamber a storage space for fuel; the intake window communicating with the interior of the reservoir through a conduit whose intake orifice is located a short distance above the bottom of the reservoir; and the last cylindrical portion communicating with the interior of the reserve container through