Recently purchased this plane and have been stumped by a lean condition when the engine was hot.  Kinda surprised this wasn't found during the pre-buy, which was concurrent with the annual.  It would appear there is no O-Ring gasket on tube number three.  I'll attach a pic of number three and also number one for comparison.  You can clearly see the red o-ring on number one.  Gonna order up a set of gaskets for that tube today. V/R Rusty Nance