Hi Guest!
Hey - did you know if you click on the title of a thread it will take you to the first unread post since you last visited that thread?
but were afraid to ask: 
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smilie in place of the real @
Pretty Please - add it to our Events forum(s) and add to the calendar! >> 
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After performing what I thought was a thorough cleaning and leak check, followed by external sand blasting and paint I installed my fuel tank in the BN-2 project. After a couple of months I found a leak small enough to cause a stain on the tank, but no drips on the floor. Rats. Out came the tank. I had another tank that was in solid condition, but had some stuff rattling around inside that I could not for the life of me get out ( turned out to be a football sized mouse nest of a huge variety of materials). I decided that rather then take the obvious route and dry out the tank, purge with argon and weld the pin hole, I would become insane and take the other tank, remove the leaded and riveted on sump and go in there to clean out the mess , reseal the sump and start with a tank I knew to be clean and solid. Melting away the lead and drilling out the rivets was easy. Once inside the tank I discovered why I could not get the junk out. There are three full span baffles in the tank that are the same rectangular cross section (they run fore and aft) as the tank, save for the corners which are cut out to allow free flow of fuel but hold down the sloshing back and forth. These baffles are leaded in place. The mouse nest was behind the baffle furthest from the filler neck. I became enraged and knocked out all three baffles ( they came free easily and I was surprised to not need a torch to melt the leading ). Satisfaction ! Cleaned, and sand blasted. Welded the baffles in place, decided to weld the sump back on rather than lead it (also skipped the rivets), and now I have what I want. I treated the inside of the tank with "Must for Rust", I've used this to keep steel from rusting for many months. Of interest is that the inside had previously been "sloshed" with a sealing coumpound. The coverage was spotty in some places due to the need to probably fill the tank completely with the stuff to get coverage on all sides of, and under the 90 degree flanges of the baffles. If I ever were to coat the inside of one of these tanks with any sealing product I'd circulate it for far longer than I would have had I not seen how the tank is set up inside. Hope this helps someone, somewhere. Also worth knowing is that if you remove the drain plug, you can ream the entire length of the fuel pick-up tube as it ends just above the plug hole.
