Passat (B7) :: Faint Air Pump Sound When Car Is Shut Off?
May 5, 2014
I'm hearing some sound when I shut off my car. There is a faint, air pump sound coming from the passenger rear area near the fuel filler door. It has run the last 3-4 times I've shut off the car recently and runs for a few minutes after shutting the engine off (welcome home lights go off, all doors are closed and the pump sound continues).
This isn't the fuel pump sound that happens when you open the driver's door and the fuel pump primes. This is a quieter, air pump sound from the rear of the car. I'm guessing it's related to the fuel system? Maybe pressure testing the vapor recovery system or fuel tank/gas cap for leaks?
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