Strange motor noise below bed

[OrienteeringMapGuy]

About 6 hours after I drove my 24 Tacoma Sport, I noticed a noise like a small motor running as I walked by the tailgate. I got under with a creeper and determined that the noise came from a black box right above the passenger side of the spare tire. The noise continued for at least 5 minutes. As an experiment, I started the engine and shut it off. The noise stopped. I would like to know what component this is and if it is normal. With the thought that it might involve the fuel pump or gas tank, I checked the gas cap and found it tight.

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[timetoeatpotatoes]

Vacuum test on the fuel tank? I've heard this sometimes

 

[OrienteeringMapGuy]

Thanks!

Another post showed up in "Similar Posts" stating that it is normal and mentioned in the first 10 pages of the owners manual.

 

[soupy1234]

Yeah. It's normal. But it is a bit freaky when you're sleeping in the bed and it goes on and on and on and on. I recommend a battery booster just in case.

 

[LincolnSixAlpha]

Funny, I noticed it many many months ago. Was wondering what that was. Like a little motor wirring.

 

[chasea1989]

I'd have to look more into it, but that sounds like a vacuum leak detection pump for the evap system.

 

[Yotota]

Yep, EVAP system leakdown test. I freaked out the first time I heard mine do it.

The manual says something about it too. It happens 5hr after shutdown.

 

[Brent@ANParts]

As long as it stops, you should be good! I remember hearing a strange electric motor noise on my Audi one day, the ECU fried itself and the fuel pump just kept running until I disconnected the battery.

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