There are mount and pulse isolators that can be messed up with the install and maybe something got messed up in the tank but strange that it started out OK. You'll know more when you take it apart again. You would probably be better off getting the whole unit. The Delphi unit from RockAuto is a really good deal.

Carter could be relied upon for quality back in the day, but between fakes, companies being bought out, attitudes changing and everyone trying to cash in on a company's the previous reputations who knows anymore ?

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)