An automotive fuel filler pipe ball valve assembly mountable in an opening of an automotive body panel. The assembly includes a housing member having a ball valve receptacle communicating with a housing inlet opening and a housing outlet opening, and a ball valve member having a passage with an inlet opening and an outlet opening. The ball valve member includes a stem member extending through an opening in the housing member, wherein the stem member is engageable by an actuation member to pivot the ball valve member in the housing member, thereby opening and closing the ball valve assembly. One or more sealing members form leak-proof seals between the housing member and the ball valve member. The assembly is mountable onto the body panel by resilient engagement members breakable to separate the housing member from the automotive body panel during impact.