How loud is it? You should be able to hear it outside the truck...definately not inside the cab however. If it's obnoxious loud than it's likely dying like sevenfold noted. Make sure to change your fuel filter:read:....a lot of people totally forget this and it will accelerate pump failure.
The wind down after shutoff is totally normal as well and typically a little louder than normal operation. These fuel pumps are far from quiet but when they start getting loud in the cab you've got some issues. Keep up to date on the filter as a dirty one will kill the pump.
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