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Mostlikely its cracked,if you get gas and open the cap it should be pressurized and let pressure out and be noticeably loud .Look under the car and see if you can see raw gas on the tank or smell it?Next if your still not sure id take out the back seat and remove the bolt you heard the cracking noise with and see if theres gas on the bolt or smell in the hole.And if your still not 100% sure drop the tank seeing how it gonna need to get fixed and or replaced any way.
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