Similar to Garf's suggestions, I was given a rather large amount of micro scree a friend of mine picked up while fixing US Marine Corps. F-4B Phantoms in 'nam. He gave me a life time supply back in 1973. Very, very fine stainless screen, the smallest I have seen and it works great! Micron wire...... have to cut it with a good set of tin snips. Fuel will pass through, but not much of anything else.
Big Bear