How old is your fuel line? Some fuel lines have an internal liner that has been known to delaminate and cause a blockage!
Also, you mentioned recently cleaning the tank. Did you use any sealant on the sending unit gasket? Years ago when I was young and dumb, I used RTV/ silicone, which is not resistant to gasoline, and a bunch of it got into the tank and plugged the fuel line, causing exactly what you’re seeing! I wouldn’t use any sealant but No. 2 Permatex, the type that does not harden.
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