Originally posted by RyaN95i4
make sure the long tube you added has relief holes higher up than the bottom, or else if the can ever has enough oil that the bottom of the tube is submerged, you'll be sucking straight oil.

I thought the point was to have the oil/air mix enter the can via the long tube (inlet) and then since there is no tube on the outlet side only air would exit (unless of course the can is completely full of oil). Am I missing something? Does the air flow both directions? I thought the check valve prevented that.