Hi Dave
I have no filters in my system. Only the fine screen in the gascolator. In 200 hours I have had no issues. Actually, the inspector would not approve an "in line" filter anywhere in the system. Apparently problems have occurred with moisture swelling the membranes and restricting flow. I buy my fuel at a bulk dealer and store in a 45 gallon drum. I have a very fine filter cartridge and water separator on my hand pump. I also hanger the a/c.
Cheers
Don Model 5 Vixen 912UL.