What was found
(CAN) ON TAXI PRIOR TO TAKEOFF, THE CREW WERE ALERTED TO SMOKE EMINATING FROM THE ENGINE. ON TAKEOFF THE ENGINE EXPERIENCED AN UNCOMMANDED SHUTDOWN. THE CREW DECLARED AN EMERGENCY AND RETURNED TO POINT OF DEPARTURE. INITIAL INSPECTION REVEALED THE EMERGENCY FUEL SHUT-OFF VALVE HAD ACTIVATED. PWC WILL INVESTIGATE THE EVENT AND SUPPLIMENT THIS REPORT TO REFLECT ROOT CAUSE, ONCE DETERMINED.