Original post by: Islebee ,
It was a lot of years before I owned a truck with an air drier, from the factory and then it was optional and NO, they did not come with alcohol systems, either. Your purge valve is bad, that is all. Disconnect the two big lines, from the drier and connect them together. Don't worry about the little line, just leave it hooked up to the air drier. Done this many times, over the years and never a problem.