[SpudRider]

Originally Posted by Inroads

You won't find an obstruction because it is operating as designed.

The fuel is leaving the engine as fumes. There isn't enough pressure to force a liquid up the elevated crankcase vent. The oil separator is supposed to separate the lighter gasoline fumes from oil and other contaminants, and the gas fumes are supposed to be drawn into the air box. That is the design.



Since fuel is collecting in the bottom tube, there must be either an obstruction in the partial vacuum line to the air box, or the oil separator is defective.