My neighbor has an old tiller with a Briggs 60102 motor. The fuel
tank is screwed to the carburetor as a sort of float bowl. A
plastic tube with a screen on the end extends down into the fuel.
It seems to be clogged, probably with off-season deposits.
How can I remove the tube? A 9/16" wrench fits the screened end,
but it won't turn and so far has not slid out. If it won't come
out, is there a solvent that could clean it in place?