Reely340
The supply tanks to the engines were found to be empty. The pump switches that supplied fuel from the main tank which still contained fuel were found in the off position. The adjacent prime switches were found in the on position. If the impact forces in the crash were sufficient to change the switch positions, all the switches would have been found to be either on or off and not as found, two on, two off. The switches were found to be in the exact reverse positions to those expected in normal flight. Only one person on the aircraft was responsible and permitted to operate those switches, the pilot. QED.