I'm with gmcfan, keep it inside. Think its more likely to be ruptured in an accident if outside anyway. These older trucks have twice the steel than the new models. And tight connections will eliminate most if not all fumes. My 2 cents worth.
Bruce


Bruce
Old Toy: Ol' Betsy stock 59 Apache SB Stepside (Gone but not Forgotten)
New Toy: 1962 Impala SS Coupe
The Driver: 1990 Toyota truck