I took an evap hose off of my canister yesterday, put my mouth to it (using my hand as a gasket), and blew threw it to if it was blocked. It felt about right. (With the gas cap removed it felt like blowing through a straw, which should be right for the evap vent through 20 feet of hose. With the gas cap on I could not blow through it.) That supports my guess that it's the filler neck, not the evap vent, at fault for my inability to fill properly.
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