Noise from gas tank (metal expansion)
2002 GMC 2500 SLE with extra large gas tank (46 gallon). Makes a banging sound a few minutes after stopping a vehicle and turning off engine. It used to rarely do it an now I hear the sound sometimes when driving down the road. I do have a locking gas cap. At least I think the sound is coming from the gas tank. However I could not rule out catalytic converter or muffler.
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