THE PLT DEPARTED COX SKY RANCH FOR A FLT TO STONE MT, GA. WHEN HE COULD NOT RECEIVE NORCROSS VOR, HE STATED THAT HE THOUGHT HE WAS HAVING NAV RADIO PROBLEMS AND ELECTED TO LAND AT MONROE, GA. PRIOR TO LANDING HE NOTED THE RIGHT FUEL GAUGE READING ALMOST EMPTY AND THE LEFT ALMOST 3/4 FULL. THE FUEL SELECTOR WAS ON BOTH. AFTER LANDING AT MONROE, THE PLT DID NOT VISUALLY CHECK THE FUEL LEVEL IN THE TANKS. AFTER ABOUT 30 MINUTES ON THE GROUND, THE PLT DEPARTED FOR STONE MT. AFTER 4-5 MINUTES IN THE AIR, THE ENG LOST POWER. DURING THE FORCED LANDING ROLL, THE NOSE GEAR STRUCK AN EARTH RIDGE AND COLLAPSED. THE ACFT CAME TO A STOP ON ITS BACK. THE LEFT FUEL TANK WAS FOUND ALMOST FULL OF FUEL. THE LEFT TANK OVERBOARD AND VENT PIPE BETWEEN THE TANKS WAS OBSTRUCTED BY EARTH LIKE SUBSTANCE. WHEN THE OBSTRUCTION WAS CLEARED, A STREAM OF FUEL FLOWED FROM THE PIPE.