Damper for a fuel line for an internal combustion engine, comprising: - a housing having at least an inlet and an outlet for a fluid, - a membrane located in the housing and intended to be in contact with the fluid flowing from the inlet to the outlet, - a damping chamber defined by the housing and the membrane, - a fluid chamber, separated from the damping chamber by the membrane, in fluidic communication with the inlet and the outlet; wherein: a peripheral edge of the membrane comprises an enlarged and/or thickened portion which includes at least two opposite protrusions (14a, 14b) that are inserted respectively into two grooves (16a, 16b) of the housing, the two grooves defining a recess, for constraining the membrane to the housing; the housing comprises an upper half-body and a lower half-body between which the membrane is interposed, and wherein the grooves (16a, 16b) are defined respectively by said half-bodies (21, 22); the upper half-body has a first rim, and the lower half-body has a second rim, such first and second rim (24, 26) being annular and extending along an axis substantially perpendicular to the membrane which is substantially planar when it is not subjected to deformation or vibration; wherein the first and second rim (24, 26) are welded together; the upper half-body has an upper wall and a side wall facing the damping chamber, and the first rim is disposed radially external to the side wall and is connected to the side wall by a connecting wall; the second rim is connected with a horizontal and/or transverse surface of the lower half-body; wherein the recess is defined by the connecting wall, the second rim, and the surface; the enlarged portion has two transversal protrusions: an upper protrusion and a lower protrusion, said protrusions (14a, 14b) having different shapes. - a housing having at least an inlet and an outlet for a fluid, - a membrane located in the housing and intended to be in contact with the fluid flowing from the inlet to the outlet, - a damping chamber defined by the housing and the membrane, - a fluid chamber, separated from the damping chamber by the membrane, in fluidic communication with the inlet and the outlet; a peripheral edge of the membrane comprises an enlarged and/or thickened portion which includes at least two opposite protrusions (14a, 14b) that are inserted respectively into two grooves (16a, 16b) of the housing, the two grooves defining a recess, for constraining the membrane to the housing; the housing comprises an upper half-body and a lower half-body between which the membrane is interposed, and wherein the grooves (16a, 16b) are defined respectively by said half-bodies (21, 22); the upper half-body has a first rim, and the lower half-body has a second rim, such first and second rim (24, 26) being annular and extending along an axis substantially perpendicular to the membrane which is substantially planar when it is not subjected to deformation or vibration; wherein the first and second rim (24, 26) are welded together; the upper half-body has an upper wall and a side wall facing the damping chamber, and the first rim is disposed radially external to the side wall and is connected to the side wall by a connecting wall; the second rim is connected with a horizontal and/or transverse surface of the lower half-body; wherein the recess is defined by the connecting wall, the second rim, and the surface; the enlarged portion has two transversal protrusions: an upper protrusion and a lower protrusion, said protrusions (14a, 14b) having different shapes.