Anyone know what this pump is?

I walked out to my garage this morning and heard some sort of pump whirring and a bit of air escaping. For reference this is located through the passenger rear wheel well, under the bed. I went back inside to get my phone and take a couple videos and it’s been going for at least 5-10 minutes. Truck has been parked for about 10 hours.

 

Would be part of the evap system. It runs and will shut off after a bit. Keeps tabs on fuel system and is normal

 

That was my first thought, I’ve heard it on my Tacoma and my wife’s 4Runner but always seemed a bit quieter. I guess this one is louder since it’s a bigger wheel well opening