You almost wonder if the gunk is back feeding from the engine into the carb. That or the gunk is solidifying right there at the screen.
ORIGINAL: karolh
I use a weed wacker clunk / felt filter on my fuel jug's pickup, then an automotive filter in the hand pump's feed line and a 130 micron mesh filter in the carb's feed line...still got gunk in the carb screen.
Karol