I dunno about Chavismo, but as for me, turning the petcock to OFF didn't help. So I took the tank off and took a closer look. It seems I have a leak somewhere at the base of my tank, near where it joins the seat, I don't know how. I can't tell exactly where it is, there's no obvious hole or crack, but if I wipe the area clear it gets a dewing of fuel after a few minutes. No beading or droplets, it just... comes from somewhere. Probably from around some possibly rusty areas under where the tank bolt goes.
I only took my tank off for the first time about a week and a half ago, so my guess is that part of the tank that's under the metal bracket that goes to the center bolt (under the seat) had rusted in such a way that when I cracked the bolt, it also cracked a tiny seam at the bottom of the tank. That's when I first started having this problem.
So, I put duct tape around the bottom of my tank as a temporary measure. I must have used too low a grade of duct tape as by the time I was putting my seat back on (after only putting on the three tank bolts and reattaching the petcock fuel hoses), the tape was already coming loose a bit from the seepage of gasoline underneath it.
So, now what? I am no welder, I have no welding equipment and am not about to try for the first time near anything that has or had gasoline in it
No, I'm gonna try something made by Dow Chemicals called "Great Stuff" fill and foam sealant. I got a can that says it's waterproof and for plumbing use. Unless someone tells me in the next 30 minutes or so that it's a bad idea?