![]() If instead you hear a sharp whining sound from your fuel tank, then this is very likely a sign you need a new fuel pump. A well-functioning fuel pump generally gives off a soft humming noise when your vehicle starts up. One of the first things you might notice with a bad fuel pump is that your car sounds different when it is on. Having a bad fuel pump can leave you stranded, so it is important to recognize the signs of a bad fuel pump and understand how much it costs to replace it. If there are any problems with your fuel pump, this becomes evident very quickly. ![]() Usually, if functioning well, it sounds like a soft hum in the background of your car. This kind of pump turns on when you put your key in the ignition and turn to run/start. Most lift pumps today are electrical, although a few mechanical pumps still exist.Īn electric fuel is in a vast majority of the cars that are on the road today. In diesel engines, fuel is delivered via a “lift” pump, which brings fuel from the fuel tank to the diesel injection pump, which turns the lower-pressure delivery of the fuel into extremely high pressure for a diesel injector.
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