A fuel module, especially for the diesel fuel of an auto-ignition engine, having a fuel tank (10) and a fuel filter (11). The fuel tank (10) has a wall (12), which encloses the volume of the fuel tank (10), and the wall (12) has an opening in the region of the fuel filter (11). The fuel filter (11) is sealed to the wall (12) in the region of the opening and contains a filter medium (26), which is suitable for separating water from the fuel, which is to be cleaned. Also disposed within the fuel filter (11) is a water storage unit (38) in which water separated from the fuel is collected.