TL* THE CONTACT OWNS A 2006 DODGE RAM 3500. THE CONTACT STATED THAT WHILE DRIVING 70 MPH, THERE WAS SMOKE SEEN FROM THE HOOD AREA. THE CONTACT LATER DISCOVERED THAT THE NUMBER 4 INJECTOR LINE WAS CRACKED NEAR THE ENGINE SIDE OF THE FITTING, WHICH WAS LEAKING A LARGE AMOUNT OF FUEL INTO THE ENGINE COMPARTMENT. THE VEHICLE WAS TAKEN TOA DEALER WHERE IT WAS DIAGNOSED THAT THE NUMBER 4 INJECTOR LINE NEEDED TO BE REPLACED. THE MANUFACTURE WAS NOT MADE AWARE OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 115,000.