An ascMcLaren forum for 84-86 Capri and 87-90 Mustang based cars modified by Automotive Speciality Corporation, a Division of American Sunroof Corporation. (no affiliation)
My fuel light comes on when I still have 7/8ths of a tank of fuel. I learned to just live with it. Started out at 1/2 full and has slowly been creeping upward. Doesn't bother me and no one sees it when it's not running.