I recently went to fill up my horizontally mounted propane tank on our '86 Jamboree. Problem was. . . .it wouldn't take propane. Now, due to a baaaaad experience when we let friends use it for a week, I know the tanks were empty (it's a long story. . . .but their hearts were in the right place. ANYWAYS. . .the tank was most definately empty. I tried three different places to make sure it wasn't a problem with the service stations propane tank. Still NOTHING. The last place said something about possibly having to purge the tank since it was run empty. Does anybody out there have any input on this matter??? Has it happened to you. . . .and if so. . . .what, oh what did you do to fix it. Could it be a check valve problem??? Any ideas on this would be GREATLY appreciated. Thanks. . . Scotty B.