If this part is making a low humming sound, then there is nothing to worry about. The pump is supposed to make this noise, and most people are used to it. An electric motor generates this sound, which will always make a soft hum when your engine is turned on. But if you notice your fuel pump whining or buzzing, then there is something wrong with the pump. Along with other symptoms, this odd sound is a clear warning sign that this component is failing. You should replace it as soon as possible.  Additionally, you can take your car to an auto repair shop and have a skilled mechanic look at it. Diagnosing and repairing your vehicle is easy for them, and they might even teach you some things about the fuel system.  '