i just flew N62ZM again today after employing the procedural suggestions of running each tank before departure.  I had no problems today.  I try pressurized flight next.  Hopefully the new Teflon lined flex lines solved it.  I have yet to shroud the engine driven fuel pump or move the electric pump lower near the co-pilot floor and mount it horizontally.  If the problem occurs again, I’ll do that next.  So far, the flex lines look promising.  I’ll keep you posted