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Rickspeed

2016 Highlander, pump like sound coming from the back of vehicle 4 hours after shutdown.

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I found this online after having the same thing happen on my 2017:

 

Normal characteristics after turning off the engine.

Approximately 5 hours after the engine is turned off, you may hear a sound coming from under the vehicle for several minutes. THis is because the fuel evaporation leakage check is performed and is not a malfunction.

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  • kcripper is correct.  It is the on-board vacuum pump running to verify the evaporative emissions system is operating correctly.  You can find this explanation in the owner's manual also.

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