Interesting ideas LDM. Thanks for the insight. The original ARF had the neck of the tank supported at the firewall adjacent to the engine mounts........this setup shook the tank like hell and caused bubbles in the line with and without the cowl on. I bult a tank support about an inch back from the firewall, cut a big hole in it and lined the anulus with foam where the tank was supported. Also provided foam in all the saddles that support.touch the tank. The fuel line does not touch any part of the fuse except for a small cable clamp that again ive lined with foam. I will try your ideal regarding the cowl attachment and inner tube strips. Incidentally i used a similar concept between the engine rails and the firewall to isolate the engine as much as possible.