Hey Pop, Cool the tank system with the rotating clunk would certainly stop any noise if it is coming from the clunk while a bit expensive its always worth a try. Personally I would go with a Tetra bubbles tank which has no clunk and definitely provide superior fuel delivery (only my opinion). I use them almost exclusively in my controlline airplanes several of which are profiles with the tank in the wing. I also use the bubbleless tanks in some pylon racers and some sport airplanes.

I am interested how you fare with the rotating clunk tank as I have no experience with those



John