Thanks guys this is great info. For now the tank is in and will try as is with the recommended setup from Evolution. I did add a wide brass nut on the pickup line just behind the felt clunk to add some weight. It is going to be a mission to get this tank out so hopefully it works well. Thanks for the recommendation on the Echo black tubing I will take a look into that. I agree the felt clunk is too big for the size tanks its going into. Its pretty much a quarter of the height of my tank which probably means it will start sucking air when my 8oz tank still has 2oz in it. These clunks should still have a small centered hole for the pick up and then afterwards expand around the felt filter so that it can pick up most of the fuel in small tanks.

Thanks Brian, I will go look at the filter clunk you used on yours

As a general question, are there not in line felt filters that could be used? Generally I never used tank filters on any of my planes bigger gas or Nitro as you have to strip the tank to check them. In line would be so much easier and you could stick to 2 pipe tank systems like old glo tanks instead of now having to need 3 pipes. Seems much simpler. How come I dont have to use felt filters on my larger 23cc, 26cc, 55cc etc?

Thanks again
TtT