Hello, I have a '73 CB350 where the rear gas tank connection ports are blocked. The tank was resealed at some point in it's life and I suspect this is the culprit. I can run a pipe cleaner (smoking pipe type) through one side and it will go pretty much up to where the pipe comes out of the tank. On the other side the pipe cleaner goes in maybe 1/2" and hits blockage. Has anyone ever dealt with this dilemma? I discovered this after removing the tank to do some carb work.