Originally posted by mjd3
Sounds like fret to me. I have a through the wall tank on my Cap and Avistar. Used some silicone all around and have 1/8" or more isolated by the silicone, which will dampen vibration.
No fuel foaming issues.
This is my perfered method for mounting tanks if at all possible since it gives very easy access to replacing the fuel lines should the need present it self. I've done this on countless pattern and sport models without a single foaming issue.
John