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I had the same syndrome on my 16 Dauntless. I had the separate tank vent on the outside of the gunwale. Both the filler line, and the vent line were clear of any blockages. Turned out that the boat normally sits very low at the stern, and the tank is actually then tilted at a bow-to-stern angle. It took very little residual fuel inside the tank to block the vent, and the result was the blowback thru the filler, which prevented any efficient filling activity. I had to have a couple passengers sit in the bow to trim the boat enough to clear the fill vent opening in the tank. I finally resorted to filling the tank while the boat was still on the trailer.