Shot on location in Miami, Racing Fever is concerned with a professional hydroplane racer named Pop Gunner, who's getting ready for one last race before passing his crown on to his son Lee. Pop's main competition is the wealthy, but oily, Gregg Stevenson, who also happens to be having an affair with Pop's daughter Linda.

A woman who believes she has been chosen by God to heal people is taken in by a greedy promoter and his shrewish wife to make the rounds of the rural South.