You're probably right. It's probably picked up some crap from the bottom of the tank.
I'd say it's blocking one of a couple things, shouldn't be too serious. First I'd replace the fuel filter, since it's like 4 bucks anyways, then it clean out/check the fuel hoses for proper flow, and if it's still not working, start methodically cleaning the carb with carb cleaner. I'd just go down the gullet first up, but if that doesn't work, rip off the top cover plate and then check all the jets' etc for debri, and clean up with carb cleaner.
If that doesn't work, check the fuel pump (but I doubt it'd be that)
Hope that sorts it.
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