At the body shop I work at we have to repair motor cycle gas tanks quite often and we usually drain them let them sit out for a day or so and then fill them with water and proceed to weld or use the stud gun on them with no problem. I worked with a guy that has customized harleys for the better part of his life and he did it the same way. If this scares you then don't do it but if the tanks were gonna blow I think they would have in the 40 or so I've seen and worked on my self.
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