Any idea what the sound is? (From engine bay).

[Habu]

Happened a dozen times roughly.

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[lucky phil]

If you are going to listen to all the sounds a modern car makes like this then you'll drive yourself crazy but for what it's worth maybe it's the fuel pressure regulator bleeding off fuel pressure as the fuel system heat soaks after shutdown.
Phil

 

[Habu]

I think you nailed it Phil. I did prime the engine prior to this.

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