Fuel Delivery problems of the 2010 Buick Enclave

The contact owns a 2010 Buick Enclave. The contact stated that after entering the vehicle, there was a knocking noise coming from the vehicle prior to starting the engine. After starting the vehicle, the noise became louder. While operating the vehicle, the check engine warning light remined illuminated and a humming noise was present. The vehicle was taken to the local mechanic who indicated that the transmission gear was faulty. The vehicle was serviced however, the failure persisted. No further information was available. In addition, after refueling the vehicle would not immediately start up. The cause of the failure was not determined. The local dealer and manufacturer were not notified of the failure. The failure mileage was 120,000.