There are treatments like Kreem and Por [ I think that's correct ] that you can use to seal the rust.
A non corrosive way to get rid of rust is to mix black treacle and water and leave it in the tank for a couple of weeks and then rinse well .
Keep the tank full of petrol to avoid more condensation and the resulting rust .
An inline filter will help keep the rust out of the carb[s] .
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Blessed are the cracked, for they let in the light. - Spike Milligan
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