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If it sounds like its coming from the fuel tank then it is most likely the fuel pump. Very common...humming noise. My father has a 1999 silverado and a 2002 Denali, I had a 2001 silverado and now a 2002 silverado. They all have or have had the fuel pump humming. My theory is dont fix it till it breaks. The only one that had been replaced was the 2001 while it was under warranty.
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2002 2500HD, 6" RCD Suspension lift, 16x10 Weld Stonecrushers w/315/75/16s
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