... somewhere around the Catskills on a nice chilly MLK Day flight. After the flight I was too cold to hang around and do much troubleshooting, and it didn't cross my mind to look for fuel staining (as recommended by @carusoam on another related thread from a few years back), so I didn't do any other investigation beyond snapping a photo. The errant gauge is the right sight gauge, 1995 J 201 MSE. I have the maintenance manual at the hangar (too cold to think to bring it home), but if a