I’ve had a Svea for 30-years. I have 2 of them. Lots of people like to say they are bombs, but having asked almost every person that says that, not one of them has actually seen one vent. I’m convinced it’s an urban myth that just gets taken for granted. A friend or a friend of a friend etc. says one vented, but never a first hand account.
No I don’t filter the gasoline at all. I have only used gasoline in my Sveas and never had one clog at all. It may be an old design (first came out in 1899) but it’s still a very good stove that I feel has many more years of life and use ahead. New ones are priced high by most peoples way of thinking ($100.00) but it’s going to outlast the buyer and can take a lot of abuse in a wide range of environments and next to wood it’s the least expensive camp stove fuel made. As far as burning dirty, it’s a nice blue flame?
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You can run, but you'll only die tired.