Bob, it doesn't really work that way with fines in the fuel. There is usually a small amount of gum some of the time, and the gum glues the fines together. This all happens in a small passage of course, especially right upstream of a seldom-adjusted mixture needle, where a sudden drop in flow rate causes particles to get deposited (like on the inside of bends in a meandering river). Once a few grains of fines stick together, they make a base for a blockage that just grows like a vegetable from a seed. That is why carb cleaner has such a profound effect: once you take the gum out, you just have loose grains that will fit through the passage under air pressure.
The Briggs red filter is intended for gravity-fed fuel systems, and the black one for systems with a fuel pump. You shouldn't expect to be able to use a black filter in a gravity system: there is just too much restriction.
