THE PLT CALLED THE ARPT ON UNICOM AND ASKED HOW TO FIND THE ARPT, STATED THAT HE NEEDED FUEL AND ASKED IF FUEL WAS AVAILABLE. HE WAS GIVEN DIRECTIONS AND ASKED IF HE HAD LANDED THERE BEFORE. HE REPLIED NO, AND INQUIRED ABOUT THE TRAFFIC PATTERN. IT WAS EXPLAINED TO HIM. HE WAS OBSERVED APPROACHING THE ARPT FROM THE NE AND FLYING DOWN THE VALLEY. HE ATTEMPTED TO MAKE A TURN INSIDE THE VALLEY, OVER SHOT THE TURN AND CRASHED INTO THE ROCK FACE OF A CUT ON THE EAST SIDE OF THE ARPT. LESS THAN ONE GAL OF FUEL WAS FOUND IN THE LEFT WING. THERE WAS NO FUEL FOUND IN THE RIGHT WING. THE PAX STATED THAT THEY HAD JUST HEADED NORTH TOWARD HOME AND DID NOT HAVE A REFUELING STOP PLANNED AT ANY SPECIAL PLACE. THERE WAS NO FLT PLAN. THE AIRCRAFT FLEW ABOUT 1 HR AND 28 MIN ON THE DAY PRIOR TO THE ACCIDENT. (NORMAL FUEL CONSUMPTION 10.8 GPH). RECORDS SHOW THAT ONLY 7 GALLONS OF FUEL WAS ADDED AT KAY LARKIN AIRPORT.