The pilot reported that he had refuelled the aircraft to 80 litres per tank prior to departure. Preflight and engine checks were normal. Soon after takeoff, as the flaps were retracted at about 120 ft, the fuel pressure dropped to zero and the engine stopped abruptly. The pilot immediately landed on the remaining runway but was unable to stop the aircraft overrunning the runway into rough terrain, collapsing the nose landing gear. He reported that during the shut down checks the fuel selector was turned from the left tank to the off position. No defects were found when the engine was stripped after the accident. It was reported that the engine ran normally during a test run after reassembly, using all of the original accessories. The reason for the sudden engine stoppage was not determined.