Back when I restored my Model A, I cleaned the tar out of the gas tank with a gallon of lacquer thinner. It dissolved it in no time. That might be worth a try.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
