Our 1973 Mustang is 42 years old, which means the gas tank has seen 42 years worth of various qualities of gasoline, sludge, condensation, residue, and most likely rust. Since we’re upgrading the engine to a blown and injected (Holley Terminator EFI) combination, we knew the stock tank, lines, and mechanical pump were out of the question for use, so we needed a new tank and fuel system.