This is a pic of the inside of my tank. For years there was a product that was used to coat the inside of gas tanks made by POR 15. It was their silver coating and they no longer recommend it for that use. I'm living proof and it's probably because of the alcohol content in the gas. Did everything right too. I remember cleaning it well and etching the metal. It cured for months too.
The problem started then I would drive the car and it would die out in the same place and having to limp it back home or tow it. The coating was lifting and coming loose then plugging up the outlet hole not letting enough fuel to reach the pump. Anyway I'm getting a new tank tomorrow and that should cure it.