one of the reasons I got rid of my "see thru" filter...it bugged me seeing no gas in it after the car got hot, it was running , but filter was empty...gas never showed up....lol
plus I was worried about a glass or plastic filter cracking, and spill fuel....went to a metal filter...

what about your filter location? is it in a very hot place? close to a exhaust or such? I tied mine up with a tie strap right behind the fan shroud so the fan blows on it all the time...