One sure way to eliminate the foaming problem is to use a bubbeless type tetra or Jett brand tank that has no clunk. No air is allowed in the fuel chamber thus no foaming or unporting. Another advantage these tanks are installed without foam, nice in a tight nacelle.

I recently installed these in my Quad Kadet before its last flyin. My chief reason was momentary unporting during some aerobatics of the outboard engines (possibly due to centrifical force out on the wings and the inability of the clunks to keep pace. Takes a little longer to fuel and not cheap tanks but the obvious added reliability is worth it to me. Although it was interesting always before in a big roll as the outboards unported just for a few seconds, hearing the crowd gasp and waiting for a crash only to be disappointed. This no longer occurs with the Bubbeless.


These have been pretty standard with the pylon crowd for years now and the fuel delivery performance is far better than a conventional muffler pressure system. So much better that CG mounting is possible on many aircraft. This could be of great benefit on some nacelle mounted multis also.

John