There is a buzz when the car refuels.

There may be the following four reasons for the humming when the vehicle refuels: 1, the exhaust pipe leaks. When the exhaust pipe leaks, as long as the vehicle accelerates, the exhaust volume will increase, and the vehicle is prone to a loud roar. 2, the throttle is dirty, and the load of the engine will rise during the acceleration of the car. At this time, it is only necessary to increase the throttle opening. If the throttle opening is not opened to the most suitable position due to dirty blockage, the gas mixture ratio of the engine will be unsatisfactory and noise will be generated when accelerating. 3. Engine cylinder is missing, that is, one engine or several cylinders are not working normally. The common performance is that the power of the car is insufficient, the exhaust pipe is shaking badly, and the hum of engine oil can be clearly heard. 4, oil problem, if the car is short of oil, or the oil viscosity is high, the engine will also produce a buzz when refueling. It is recommended that car owners go to 4S shops or repair shops for inspection, and professionals are not recommended to repair themselves.