I ran out of gas on the DR650ES today. Or did I?. Was in the middle of one of the logging roads I ride and engine began to cut out. Suspected that fuel wasn't getting to the carburetor. Knew that there was a reserve tank position and possibly another position (found out later that it was a priming position for an empty carburetor). Didn't bring reading glasses so couldn't read the writing on the fuel positions. I just switched over to the reserve tank position and bypassed the prime position because I didn't know it was there. Tried to start engine on reserve tank position and still no fuel flow. Barely was able to call wife on the cell phone because I couldn't read the keys without reading glasses. After several failed attempts was finally able to get the call out. Only dumb luck that I could tell her where I was because about ten years earlier I took her to this road to show her a spot where I had shot a deer. She brought some gas and it solved the problem. The question I have is why didn't the reserve tank work? Was it because you had to prime the carburetor after running out of gas on the primary tank before switching over to the reserve tank? Or was it because the reserve tank had no gas because when I filled up I didn't switch to the reserve position to allow gas to flow into the reserve tank? Will gas flow into the reserve tank on fill-up if you don't switch to the reserve position during fill-up? In any case, several lessons learned- Check fuel before leaving, bring reading glasses, and make sure the wife knows in advance where you are if any trouble arises. Any information on the cause of the fuel problem I had will be appreciated.