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Old 24-02-12, 11:56 AM
Kevin H Kevin H is offline
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Join Date: May 2008
Location: Melbourne, Australia
Posts: 1,169
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I glued sheet roofing lead to the petrol tank in my 411. It was very effective at stopping the sound of fuel sloshing around in the tank.

Sound is transmitted into the car by panels (side or floor) vibrating. You can either suppress the sound transmitted by the vibrating panel, or stop the panel vibrating in the first place, by adding mass to the panel. Lead does this very effectively.
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