Has anyone explored inserting a rubberized flexible fuel bladder inside their rusty FJ gas tank? I know there are companies that make bladder systems for boats and other vehicles but so far most of what I see is larger, I don't see anything smaller in the 2-5 gallon range.
But if there was a small bladder that could fit into the FJ tank and hook up the petcock and gas cap I wonder if that may be a solution.
Links below to similar type products.
For what it's worth I also called a local radiator shop and they said they could clean the inside of the tank and reseal it like new but the process would harm the exterior paint job so I should anticipate to have to get the tank repainted after resealing.
https://adventureonstore.com/products/advworx-5-litres-fuel-bag-fuel-bladder?gQT=1
https://atlinc.com/racing.html
https://readycontainment.com/
https://www.revzilla.com/motorcycle/desert-fox-fuel-cell?srsltid=AfmBOoqQNhbH6zxoEVrdbcU62h6doaNgRrHNnMY4Hx5F4Yh7bNgyFZAPRbs&gQT=1