Could be. Rust was a concern for me. I also thought I should coat the interior with airplane fuel tank sealer. The car doesn't sit much. I drive it to work about 30% of the time. The other days I drive the 68. And, I live in Arizona.
I don't have a tig welder. I did contemplate brazing instead of mig.
Only time will tell
I need to pull the tank. in this car it is super easy. The fuel gauge remains on full far to long, so some adjustments to the float are needed. I can then check for debris in the tank. I did rinse the tank multiple times in different stages and beat/ scratched on the welds to loosen crap up.
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