Humming/buzzing under the truck

I’ve had a buzzing under the truck before and it usually stops after a while. I’ve it come on randomly and heard this normal. But recently it is louder and I heard it when I start the truck and after I cut it off. Today I drove about 20 minutes and when I stopped I didn’t hear it. When I got home it was doing when I parked and has been on over 30 minutes. I’ve tried locking and unlocking the truck. I’ve tried starting it and cutting it off. It is a 2020 DC with the larger gas tank with just at 50,000 miles.

 

Check and see if it is the fuel pump or fuel pump control module. Both of them can make some noise but if the noise is extended, going on a long time as you describe, could be one of them going bad.

Or if could be something in evap system.

Here are several similar threads
https://www.google.com/search?q=tun...HUaGNeEQrQIoBHoECCIQBQ&biw=1920&bih=919&dpr=1

 

There is an evap pump near the charcol canister that runs, but it usually does it ~4-5 hours after you shut the truck off. Sometimes I'll go in the garage at night and our Sequioa will be running it. I've never heard of it running with the truck on or immediately after.

 

Apparently it's a normal thing.
Had my panic last year when I bought my first Tundra and looked up a bunch of crap about it.

 

Thanks everyone, I had found various searches on several models. I have heard it on Tacoma and my tundra but not this load or long. I drove down the street and back, it stopped. If it starts getting too constant I’ll take it in. I have an extended warranty.thanks again