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Loud Noise But Not From Engine Compartment

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Hi all, I have a 90 ls400 with a noticable noise, inside the cabin only, not from the engine area. It sounds similar to the fuel pulsation I heard from the bad fuel damper I replaced years ago in the engine compartment. But this is near the middle to back of the car that I hear when in the car. I think it is the fuel pump or something related. Has anyone had anything similar happen? I don't want to replace the pump unless I am sure that is the issue. Could it be something else?

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