Re: Corrosion on bottom of fuel tank
Use closed cell foam strips or strips of lexan glued on the new tank. Water combined with little-to-no oxygen will allow aluminum ( most metals ) to corrode like that. Even if you keep water out, condensation over time will do it too. The strips are just to keep tank from sitting in any water - so Lexan will do the trick - BUT, the seal between the strips and the tank must be water proof !
I'd use a barrier coat of some sort, maybe InterProtect or similar on the new tank so aluminum is isolated even further.
I pulled my OEM tank, a '75, years ago and had the same thing you had. Cleaned it out, had it welded, epoxy coated it used closed cell foam strips - no problem. Looks like new !
Good luck
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