According to the "Lester-Steele Handbook of Automobile Specifications 1915-1942", the Pierce Arrow used an "AC" fuel pump. The model is not specified, however 1929 was AC's first year of fuel pumps. Their first pump did not have a model number but is referred to as a Model A. Later replacement castings had "Model A" cast into the body of the pump. I suspect yours would be either an A or B pump. A source of knowledge on the correct pump for your car would be Arthur Gould Rebuilders in New York. They just rebuilt my "AC Model A" pump. They advertise in Hemmings and would know what model pump you need and which pump arm is required. For example, many cars used a model A pump, but different cars had different configurations of the pump arm. Good Luck
