My original one was quite noisy - enought that I used to wonder what it was back
there until someobody told me.
The one I had put in as a pre-emptive replacement at about 100k miles is
noticibly quieter, but still can be heard if I listen for it.
Sometimes they are louder, sometimes they are louder when they are about
shot. Have the fuel pressure checked at all stages and see what that tells
you. The fuel pump in my Woman's van can hardly be heard compared to the one
that went out(still worked actually, just had a dead spot).
Its a judgment call otherwise.
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