I just installed a new tank and improved on my in tank fuel pump installation. Originally, the pump pickup sock/filter was touching/resting on the bottom of the tank. For the new install, I raised up the pump to about 1/4" off the bottom of the tank. Hopefully this will eliminate sound transmission through vibration.
Secondly, I wrapped the new tank in 80mil butyl sound deadener. It takes a total of 19sf.
These two changes made the noise imperceptible. With the engine running, at idle, window up, you have to concentrate on isolating the pump noise to hear it. Now a non-issue.
Pump mount with split ring welded in place.
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Sound deadener and tank installed.
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