A “fuel sock”, that you can put between the tank, and where you are refilling from. Especially if you have to use bottled fuel. Doesn´t remove all problems, that bad fuel could cause, but at least should help to keep the largest dirt particles from entering your tank in the first place. For example KTM offers a similar solution for some of their models, that can actually be installed into the tank opening and kept there, but portable versions are available too.
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