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Strange noise under 2005 Tahoe rear seat

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2005 Tahoe with 87k here - lately am hearing a clunky sort of tapping noise under rear seat. Sometimes the noise will appear with just the key on and sometimes not - so it isnt consistent but you dont need to be moving to hear it.


I know the fuel pump is under there but thought they whined when going bad.


Never had any problems - really love this truck and would appreciate any advice...



Edited by txab
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