2012 Hyundai Sonata Fuel System Diesel Engine Problems

TL* THE CONTACT OWNS A 2012 HYUNDAI SONATA. THE CONTACT STATED THAT WHILE DRIVING AT 45 MPH, AN ABNORMAL BURNING ODOR WAS NOTICED INSIDE OF THE VEHICLE AND A STRONG FUEL ODOR EMITTED FROM THE VEHICLE INTERMITTENTLY. IN ADDITION, THE CONTACT STATED THAT A KNOCKING SOUND WAS HEARD WHEN THE VEHICLE WAS IDLE. THE VEHICLE WAS TAKEN TO THE DEALER WHERE IT WAS DIAGNOSED BUT THE FAILURE WAS UNABLE TO BE DETERMINED. THE CONTACT RECEIVED A NOTIFICATION OF NHTSA CAMPAIGN NUMBER: 15V568000 (ENGINE) HOWEVER, THE DEALER STATED THAT THE VEHICLE DID NOT REQUIRE THE RECALL REMEDY. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 42,000.