Abstract: A fuel tank cover assembly is provided for a fuel tank having a fill tube projecting therefrom and a fuel cap for covering an open end of the fill tube. The cover assembly includes a mounting member mounted on and secured to an end of the fill tube. A cover member is releasably attachable to the mounting member. The cover member can be pivoted to a locking position wherein the housing prevents access to the fuel cap and wherein it can be secured to the mounting member by a lock, such as a padlock. A funnel member is fixed to the open end of the filler tube, and the mounting member is attached to an exterior surface of the funnel.