Around 1700 eastern time, a Piper PA-24-250 airplane was substantially damaged when it collided with terrain about 12 miles northeast of West Palm Beach, Florida, during an emergency landing following a total loss of engine power in cruise flight. There were no injuries to the pilot or passenger during what was described as post-maintenance test flight to check various systems and repairs. Work performed on the airplane prior to the flight included replacing the right main fuel tank and reconditioning the right fuel tank selector. The pilot later said he was flying with both the left and right fuel tank selectors in the main position, presumably drawing fuel from both main tanks. A little more than an hour into the flight, the airplane had a total loss of engine power.