Abstract: The invention relates mainly to a fuel tank (10) that can be adapted to several types of motor vehicle engines, comprising: —a casing (11) defining a fuel filling space, —a fuel filler pipe (12), and —a gauge/pump module (13), characterized in that the casing (11) has a shape that is suitable for covering different types of gasoline and diesel engines, and in that the casing (11) comprises passages (15) for routing and holding pipes and/or wiring harnesses, the passages (15) formed in advance in the casing (11) being capable of covering routes for pipes and/or wiring harnesses of different types of gasoline and diesel engines, such that some passages (15) used for the pipes and/or wiring harnesses of a given engine are present for an engine of another type but not used.