humming noise heard underneath gmc sierra

Asked by Dec 28, 2014 at 11:14 AM about the GMC Sierra 1500

Question type: Maintenance & Repair

1 Answer

5,825

Electric fuel pumps can make a humming noise. Mine started humming after about 18 years and is still going strong 6 years later. I did the research and I've read it's not something to worry about.

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