Fuel tank filler cap module

Vehicle fuel tank filler cap module (1), comprising a base member (2) that is fitted into the bodywork (3) of the vehicle, a cap (4) that comprises a tilting arm (5) that pivots with respect to said base member (2), and a cover plate (6) that is fitted onto the cap (4). The purpose of the cap module (1) is to be easily adaptable to the bodywork (3) of different types of vehicles, and to achieve this, the cover plate (6) is fixed to the cap (4) by fastening means (60,61,62) and comprises, on its inner face, at least one support rib (7) situated on a support surface (8) comprised in the cap (4). The support ribs (7) compensate for the differences between the shape of the profile of the cover plate (6) and the shape of the top part of the cap (4).