My pumps were *very* loud, at least one of them was, and they were ~195K miles and 14 years old ... I lived with the loud and often intermittent buzzing for quite a while, in part based on feedback from this forum. What did it for me was (I assume this is related) the fuel pump relay going out, didn't want the new one stressed by failing pump(s).

I think it was pretty apparent which one was bad, the one in the pump/filter assembly. More scary, it was leaking! So, probably could have only changed one but hope to keep the car a while longer so bit the bullet and did both.

As I said above, don't forget to check your fuel lines/hoses!

Brian