CHECK AIRMAN AND PLT OF BE35 MAKE OFF ARPT LNDG FOLLOWING ENGINE FAILURE DUE TO FUEL STARVATION. DISCOVER FUEL SELECTOR WAS NEVER MOVED TO OTHER 'FULL' TANK.

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I WAS CONDUCTING A FLT REVIEW FOR THE PLT. HIS PLANE WAS AN H MODEL BONANZA AND HE HAD APPROX 300 HRS IN THIS ACFT. HE HAD APPROX 500 HRS OF FLT EXPERIENCE. AS PART OF THE FLT REVIEW; HE INDICATED HE WAS UNCOMFORTABLE FLYING INTO CTLED AIRSPACE. WE PLANNED A FLT INTO A NEARBY CLASS D AIRSPACE APPROX 50 MI AWAY. WE LANDED AND DEPARTED WITHOUT INCIDENT. ON THE RETURN FLT AT 3000 FT MSL (2000 FT AGL) THE ENG SUDDENLY QUIT WITHOUT WARNING. I TEACH EMERS OFTEN AND COMMUNICATED THE MENTAL CHKLIST TO THE PLT. (CABC-CARB HEAT; AIRSPD (BEST GLIDE); BEST LNDG AREA; CHKLIST.) WE PULLED ON THE CARB HEAT AND I OBSERVED HIM FLYING THE BEST GLIDE SPD. I IMMEDIATELY STARTED LOOKING FOR A SUITABLE PLACE TO LAND. THE AREA BELOW WAS VERY RUGGED AND THERE WAS NOTHING IN GLIDING DISTANCE THAT EVEN RESEMBLED AN OPEN FIELD OR ROAD; SO WE MADE A SLOW CIRCLE TO LOOK IN ALL DIRECTIONS. AT THE SAME TIME I TOLD THE PLT TO SWITCH FUEL TANKS AND HE INDICATED THAT HE HAD SWITCHED TO ALL OF THE OTHER TANKS WITH NO SUCCESS. THE FUEL SELECTOR IS ON THE L SIDE OF THE PLT'S SEAT OUT OF MY SIGHT; SO I COULD NOT ACTUALLY SEE HIM MOVE THE SELECTOR. THIS HAPPENED OVER APPROX A 30 SECOND PERIOD. I THEN SWITCHED MAGNETOS WITH NO SUCCESS. THE ACFT HAS A MANUAL FUEL PUMP WHICH I TOLD THE PLT TO USE TO TRY TO GET THE ENG GOING AGAIN; ALL TO NO AVAIL. A SMALL ROAD CAME INTO SIGHT IMMEDIATELY IN FRONT OF THE ACFT. WE LANDED WITHOUT INCIDENT ON THE ROAD WITH NO DAMAGE TO THE ACFT OR ANY INJURY. LATER AFTER TALKING TO THE PLT I LEARNED IN THE STRESSFUL SITUATION HE HAD SWITCHED THE FUEL GAUGE SWITCH AND NOT THE ACTUAL SELECTOR FUEL VALVE. WE HAD RUN OUT OF GAS ON THAT TANK.