IMPROPERLY OPERATED FUEL SELECTOR VALVE RESULTS IN FUEL STARVATION TO BOTH ENGINES ON LIGHT TWIN. PRECAUTIONARY LNDG MADE ON ROAD. FUEL VALVES CYCLED; ENGINES TEST RUN AND TKOF MADE FOR ORIGINAL DESTINATION WHILE ROAD IS CLOSED BY LEOS.

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THE PROB AROSE ON MY FLT TO ZZZ ABOUT HALFWAY THROUGH WHEN I FAILED TO COMPLETELY LOCK MY SPRING LOADED FUEL VALVES ON MY LIGHT TWIN; WHILE SWITCHING TO MY OTHER FUEL TANKS. I DISCOVERED THE PROB IN MY DSCNT 30 MINS LATER; WHEN BOTH ENGS STARTED SURGING. I QUICKLY RAN THROUGH MY EMER CHKLIST WHEN I REALIZED MY FUEL VALVES HAD NOT BEEN PROPERLY SWITCHED (VISUALLY). THE ENG SURGES WERE DUE TO FUEL STARVATION. SINCE THE LNDG GEAR AND FLAPS ARE HYDRAULICALLY PWRED BY THE L ENG; I OPTED TO MAKE A PRECAUTIONARY LNDG ON A DIRT ROAD; RATHER THAN; AT MY LOW ALT; TAKING THE REQUIRED BOTH HANDS OFF THE CTLS TO RE-SWITCH THE FUEL VALVES. I DIDN'T WANT TO LEAN DOWN; DEPRESS THE SPRING WITH MY L HAND; THEN PUSH THE SPRING-LOADED FUEL VALVE WITH MY R HAND BACK; ALL WHILE THE PLANE IS FLYING ITSELF AND POSSIBLY ABOUT TO HAVE A DUAL ENG FAILURE. MY AIRPLANE HAS NO AUTOPLT. AFTER LNDG I SWITCHED THE TANKS; SUMPED THE FUEL; DID A 15 MIN PWR RUN ON THE ENGS; AND INSPECTED THE TANKS. AFTER THE CITY ROAD OFFICIALS SHOWED UP; WE MEASURED AND INSPECTED THE ROAD FOR THE TKOF. THEY THEN BLOCKED OFF THE ROAD WHILE I DEPARTED ON TO ZZZ. I COULD HAVE PREVENTED THIS BY PROPERLY SECURING MY FUEL VALVES AND DOUBLE-CHKING THEM EARLIER IN THE FLT.