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2003 GMC Sierra 2500 Question: hummung noise

 

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jesse1055, Gasoline, Gallup, NM, May 30, 2010, 11:38
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humming noise coming from underneath cab

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  • Answer #1

    February 09, 2011, 19:52
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    it is usually the electric fuel pump. try to listen near the fuel tank under the truck and have someone else turn the key on without starting the truck.

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