I use a UAT with what I would term normal heavy clunk in the tank, short fuel lines from tank to UAT and UAT to pump. Never had any fuel feed issues with any engines from 10lbs to 50lbs thrust.

I've seen a lot of over thinking/engineering of these kind of "problems" when all that's required is a little common sense.
What is a special clunk as opposed to a normal clunk Dennis?
Rob.