Does anyone recognize this lever and familiar with to know of an easy way to determine which gas tank in my '60 Burb it's pulling gas from? It is currently pointing toward front of Burb. The two tanks are over and under. Probably common sense, but the Burb is new to me and with the nearest station 21 miles away, and gas as expensive as it is, I'd feel better knowing and only having to top off one at the station. Plus, the fuel gauge doesn't work! With lever now facing front, would it normally pull gas from the main original tank? Appreciate any Stovebolters input.

http://i1279.photobucket.com/albums/y525/Azburb/a950da530456a6d5002c87e8496ea197_zpsd56c05f8.jpg