If you look at the example in the link that Klaus posted, that one was quite rusty also. If it is so important then why didn't they make it out of stainless steel or something more corrosion resistant than what they used.
I read somewhere, I can't remember where, that they used those things in order to quite the pump action, not because it was necessary to make the car run right. I can't help but wonder what would happen if it was simply removed from the equation. I would ask a good independent Volvo mechanic - not the dealer - if they have tried removing them and what happened.
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