I just finished two brand new 346XPs.  I've found that a ported 346XP will often go lean in a long cut due to the tank vent not being able to flow enough air.  The tank draws a vacuum, and the saw goes lean.  I've tried different methods of modding them over the years.  I decided I wanted something different on these two saws.  I started by removing the guts of the factory vent, then re-assemble with only the large outer piece.  This allows it to flow plenty air, but it'll also leak fuel pretty badly when full and on it's side.  That's not a good deal, since we all know about the "sideways balance" of the 346XP, lol.  I posted a thread over yonder, looking for a hose end tank vent that would work in this scenario.  It needed to be small, flow plenty of air, and be a true one-way valve.  It turns out that Echo makes the perfect little hose end vent.  Many of you probably already knew about this part, but I didn't.  It's the perfect solution to my problem.
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