THE PILOT WAS APPROACHING THE POND FOR A LANDING IN THE FLOAT-EQUIPPED AIRPLANE, WHEN THE ENGINE SUDDENLY QUIT. THE PILOT WAS UNABLE TO GLIDE TO THE POND, AND THE AIRPLANE IMPACTED TREES DURING THE FORCED LANDING. THE FAA INSPECTOR EXAMINED THE AIRPLANE AND FOUND 1 GALLON OF FUEL IN THE LEFT TANK AND NO FUEL IN THE RIGHT TANK. THE ENGINE WAS PLACED IN A TEST STAND AND STARTED. THE FAA INSPECTOR STATED IN HIS REPORT: 'THE ENGINE WAS STARTED AND RAN FOR APPROXIMATELY 15 MINUTES AT VARIOUS POWER SETTINGS...WITH NO APPARENT MALFUNCTIONS.'