SeaSlugs
Well-known member
I have soldered gas tanks, iron NOT flame. Did not drain the tank on one car to put in a strip of copper over the crack. Yes, the dripping gas vaporizes on the hot iron, but not hot enough to ignite. Solder melts at 370f, gasoline autoignites at 530f.
pssst - usually the iron tip is 6-700*F or more before contacting the metal...