THE PILOT'S FAILURE TO ASSURE THAT THE AIRCRAFT HAD AN ADEQUATE SUPPLY OF FUEL ON BOARD FOR THE INTENDED FLIGHT. CONTRIBUTING FACTORS TO THE ACCIDENT WERE AN INOPERATIVE RIGHT FUEL QUANTITY GAGE WHICH RESULTED IN INACCURATE FUEL CONSUMPTION CALCULATIONS, AND AN INADVERTENT STALL AS THE PILOT ATTEMPTRD TO REACH A LAKE SHORE FOR AN EMERGENCY LANDING.