I drive an 03 Hummer h2 and just recently in the past month when i accelerate between 1500-2500 rpms theres this grinding sound kind like a fan griding sound when i let go of the gas it goes away and it dosnt make the noice inless im driving i tried to troubleshoot in park but it dosnt make the sound!! It comes and goes sometimes louder then other its annoying PLEASE HELP!!!

 

Look under your truck at the fuel tank... see if you have 3 bands around it that look like really big hose clamps.

(reason I ask, there was a TB for the fuel tank heat shield a long time ago, and I had the same thing.)

 

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