Here is a shot of a 4mm Festo filter in my jet which is fed by Tygon..Tygon turns dark with the jet fuel and oil in the fuel combo...My fuel in my jets is filtered a total of SIX times before the injector needles see any fuel...The injectors are the size of hyperdermic needles are can't stand to be clogged....My gassers get fuel that is filtered four times before the needle and seat see fuel...The last filter being the screen in the carb..

Kevin