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There is an electric vacuum pump under the rear floor of the car, inside a black plastic box, near the fuel tank. It is there for emissions purposes to pull a vacuum on the tank to check for possible vapor leaks. It will run occaisionally for several seconds after you shut the car off to test the evaporative emissions system for the OBDII system and determine if it is functioning correctly or if it needs to turn on the check engine light becuase there is a problem.
If memory serves me correctly there is a reference to it in the owners manual and to not be alarmed should you hear it working.
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