The old grey cell have started working
I had a problem many years ago with a fuel blockage on a mini. I connected an air line to the carb end of the line and blew the blockage out. I stayed clear long enough to run the tank down to a level where I could clear the crud.
Warning - Increase the pressure slowly, make sure the filler cap is off. If the tank is anywhere full it will blow fuel out of the filler when the blockage lets go.
Probably a last resort option
"A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools" Douglas Adams