Volumetric measurement device for liquid fuel dispensing equipment, comprising: - an inlet opening connected to a storage tank and an outlet opening connected to a dispensing nozzle, - two pistons (9a, 9b) which have a substantially horizontal spindle and can each move back and forth, under the action of the pressure exerted by the fuel transferred between the inlet opening and the outlet opening, in parallel cylindrical measurement chambers (6a, 6b) having a predetermined volume, each of these measurement chambers (6a, 6b) being subdivided by means of the associated piston into two hermetically sealed compartments, namely a first compartment (A, B), or front compartment, and a second compartment (C, D), or rear compartment, - means for coupling the back and forth movement of the two pistons (9a, 9b), - a substantially vertical measurement shaft which engages with transmission members capable of converting the back and forth movement of the two pistons (9a, 9b) into a rotational movement of said shaft, and is connected to detection members for determining the volume of fuel passing through the measurement device on the basis of this rotation, and - an intake tray which is attached to the measurement shaft for rotation therewith and provided with openings (4a, 4b) for successively connecting the compartments (A, B, C, D) of the measurement chambers (6a, 6b) to the inlet opening and to the outlet opening, characterised in that the inner wall of at least one of the compartments (C, D), namely the rear compartment, of each of the measurement chambers (6a, 6b) permanently has, at the end thereof, members for automatically realigning the piston after each of the backward movements thereof, these automatic realignment members consisting of an annular peripheral shoulder or of at least two peripheral shoulders (2a, 2b; 2c, 2d) consisting of diametrically opposed circular sectors, this/these peripheral shoulder(s) defining a limit stop for the associated piston (9a, 9b) and having a planar front surface suitable for allowing this piston to be realigned. - an inlet opening connected to a storage tank and an outlet opening connected to a dispensing nozzle, - two pistons (9a, 9b) which have a substantially horizontal spindle and can each move back and forth, under the action of the pressure exerted by the fuel transferred between the inlet opening and the outlet opening, in parallel cylindrical measurement chambers (6a, 6b) having a predetermined volume, each of these measurement chambers (6a, 6b) being subdivided by means of the associated piston into two hermetically sealed compartments, namely a first compartment (A, B), or front compartment, and a second compartment (C, D), or rear compartment, - means for coupling the back and forth movement of the two pistons (9a, 9b), - a substantially vertical measurement shaft which engages with transmission members capable of converting the back and forth movement of the two pistons (9a, 9b) into a rotational movement of said shaft, and is connected to detection members for determining the volume of fuel passing through the measurement device on the basis of this rotation, and - an intake tray which is attached to the measurement shaft for rotation therewith and provided with openings (4a, 4b) for successively connecting the compartments (A, B, C, D) of the measurement chambers (6a, 6b) to the inlet opening and to the outlet opening,