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In a 2004 VW R32, after shutting down the engine, a repeated thump is heard approximately 2 times a second from the rear of the car.

What are the likely sources of this noise? My first thought is something related to the evaporative emissions (EVAP) system.

mac
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1 Answers1

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It is most likely a leaking EVAP hose or a leak in the fuel line. Make sure it's nothing obvious like a hose hanging off or a gas cap missing. Also check for a check engine light and have the OBD code read if there is one.

There is also a small chance that your fuel pump relay or fuel pump is the cause.

Scott Hillson
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