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When I bought my car brand new, I often noticed when I would unlock the doors or open a door (if it wasn't locked) or the trunk. It would make a noticeable swoosh sound. A few days later after hearing it off and on over the weekend. I called my sales guy and asked why sometimes did my car make that sound. He told me that it is pressurizes the fuel system, it does that if the car has been off for a lengthy period of time. So, I can confirm my car did make this sound when it was new before any work was ever done to it.
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