I have a bit of corrosion inside the fuel tank of my Velocette MSS and am considering options for removal. I am not planning on lining the tank, unless I need to (e.g. if the rust removal process results in a leak) but hopefully this won't be the case as rigid frame Velo petrol tanks seem to be of a relatively heavy gauge of material and the rust is not excessive.
As I see it, after washing out with detergent and shaking with some abrasive media inside (e.g. plasterboard screws, length of chain, etc.) my options are a follows;
- Fill with acid (e.g. vinegar) then passivate with baking soda solution
- Use a commercially available proprietary environmentally safe water based product (e.g. Evapo-rust, Frost rust remover)
I'd be interested to hear of experiences people have had with these methods or advice on better alternatives.