As my tech told me (and just like pre-electronics cars) “fuel, spark, air.” Remember, he said the first tech checked “the filter at the tank”. If it was a sludge problem the the tech would see significant sludge it in that filter so, I would think that moves sludge down the list as an issue. Water would flow thru both filters so that could be an issue that would exacerbate with each fill. (People would be surprised how much water builds up over the years from condensation. In tanks we removed the water bottom was often greater than the sludge layer)
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