Strange noise from driverside rear wheel well

About my 2019 4 Runner with approx. 47700 mi:
This morning i drove it about 800 meters (in altitude) up the mountain. After parking it, still at idle to cool down, i noticed a strange noise coming from the outside. It comes from the area in the rear wheel well on the driver's side, only as long as the engine is running.
It's hard to describe, something like gurgling and chirping.

Video with Sound

3 hours later, cold start, no noise. After driving downhill for a while, I heard again from the outside, nothing but some ticking noise in the rear wheel housing.
when I arrived home, nothing unusual to hear either.

Is this coming from the fuel pump? Or anything else from the fuel tank? Is this normal or are there known problems? Could it have something to do with the difference in altitude I was driving at?

Another thing, if you switch on the ignition (without starting the engine) after a longer period of standing i think you can also hear the fuel pump for a few seconds. But then it sounds completely normal to me.

Thanks if you have any ideas.