SOME 2015-2016 EDGE AND 2016 MKX VEHICLES EQUIPPED WITH A 2.7L ECOBOOST ENGINE AND BUILT ON 10/29/2015 AND THROUGH 4/1/2016 MAY EXHIBIT A KNOCKING/TAPPING NOISE THAT CAN BE HEARD IN THE FUEL FEED TUBE THAT ATTACHES TO THE HIGH PRESSURE FUEL PUMP ON THE ENGINE. THIS MAY BE DUE TO A LOOSE CHECK VALVE LOCATED IN THE FUEL FEED TUBE. FOLLOW THE TSB SERVICE PROCEDURE STEPS TO CORRECT THE CONDITION.