MD-11
Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical; Inflight Event / Encounter Fuel Issue
Flight Crew Landed in Emergency Condition; Flight Crew Returned To Departure Airport; Flight Crew Inflight Shutdown; General Declared Emergency; General Maintenance Action
Aircraft
At approximately 45 minutes into the flight; crew received a 'Fuel Qty/Used Chk' Level 2 alert.  The aircraft was in cruise flight with no other adverse conditions.  I was the RFO and had just begun scheduled rest period when called to the cockpit for this event.  The Captain continued as flying pilot with autoflight engaged and directed checklist use and confirmation of all actions related to the Fuel Qty/Used Chk checklist.  After running the checklist; we concurred that the #1 engine was the cause of excessive fuel loss and shut it down as directed by the checklist.  We initially requested holding to work the problem but once we decided to shut down the engine; we requested an initial vector to return. (Nearest suitable airport via the checklist)  We declared an emergency; dumped approximately 75;000 pounds of fuel; and proceeded to ZZZZ (also our airport of departure) where we made an uneventful 2 engine landing.  We turned the aircraft over to Maintenance. Possible fuel leak down line of shutoff valve.
[Report narrative contained no additional information].
MD11 flight crew receives a  'Fuel Qty/Used Chk' Level 2 alert.  It is determined that a fuel leak may exist in the number one engine and it is shut down and the flight returns to the departure airport.