Pullen continued driving a Mercer even after the manufacturer had ceased supporting its racing program. He switched to a Hudson in 1919 but struggled. In 1921 for his final season of racing he switched to a Duesenberg and won a 20 lap race on the Beverly Hills board oval. Later that year he surrendered his 1921 Indianapolis 500 entry to Joe Thomas but drove in relief for Jimmy Murphy on raceday but crashed on lap 107.
In July 1932, Pullen worked on a Ford Motor Company promotion demonstrating the endurance of the newly developed V-8 engine, with a 33,301-mile (53,593 km) demonstration, in the Mojave desert, near Rosamond, California.[2]