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The Electric fuel pump is the noise.The pump could last years or Quit the next time you drive the car.Sorry but I've seen them last a long time making that aggravating noise.

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12y ago
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Q: Why would there be a 'humming' sound from the rear near the gas tank of a 2001 Mercury Sable that is noticeable from the time the key is turned and while the car is running?
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