After having used a temporary tank strapped to my back rack to run my motor before transporting it for inspection, I put gas for the first time in the built-in tank frame. While I was pouring it slowly, I looked down and saw gas running on to the floor under the bottom bracket. Thought it was the petcock, was not. It was a bad (missing spot underneath) weld to the seat tube and the back end of the tank.
I know there are many fixes, but I am darned if I am going to settle for a defective "complete motor ready bike" with a repaired tank. It is the only reason I bought this frame. Oh my........