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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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Automotive
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4 Answers from these members:
Joseph Perez
by Joseph Perez Earned 1,109 community points in Automotive
March 10th, 2012
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Manage My Life
by Manage My Life
March 10th, 2012
Answered in 2 hours
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bikerbigpapa bikerbigpapa
by bikerbigpapa bikerbigpapa Earned 7,304 community points in Automotive
March 20th, 2012
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Manage My Life
by Manage My Life
March 20th, 2012
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