I fuel with a syringe. There is a filter clunk and an Sullivan filter, as shown in the link above, in the line when I fill the syringe. I take the filters off to fuel the tank with the syringe. There is another filter, usually a Sullivan, between the tank and carb. Noticed it was getting hard to suck fuel into the syringe. Sullivan filter was clean. Took the clunk filter apart and it was full of fuzzy stuff. Cleaned it out and went my merry way.