That is what most people dont understand metal has "pores" and when you apply heat to a tank that had gas in it for "years?" it starts "cooking" out, now I know the chances are slim that you will have an explosion but how much are da bees worth??
One little fact you need to keep in mind. Per volume, gasoline has more potential energy stored in it than TNT. Now just how many fumes would you need to release from the pores of the metal to make you wish you hadn't?
Ed, KA9CTT profanity is IGNORANCE made audible