Vibrating noise

Hey Fellas. I came from work today at approx 4pm. My truck is been parked in my driveway since. It's now 10pm and my wife was walking out to pickup the mail. She came back in and told me that she hears vibrating kind of noise coming from the bottom of my truck. I do have tools in the bed which is covered. I first thought that maybe something inside the bed. After close inspection, the noise was coming from some type of electrical box mounted front of the axle on the bottom below the bed . I put my hand on it, and it sure it's coming from there. The vibrating noise is kind of electricity type. Here is a picture of that box . What the hell is this? I turned the truck on and then off, and the noise went away . I'm not sure if it will be back . We will see. But the truck was parked for 5 hours. Here is a picture of the box if someone can tell me what it is please. Thanks .

 

It’s the evap system doing a self test !

 

What the hell is Evap?

 

It is the system the recirculates the fuel vapors in the fuel system .

 

Evaporative emissions.

 

Thanks brother. So this is normal ? Should you be able to hear it while next to it?

 

Yes

 

And yes

 

Thank you. I appreciate the quick reply. Have a great night. Now I can sleep better .

 

Wait a minute, don't sleep yet ... lol

How often does it run if the car is parked for several days? can it kill the crappy oem battery?

 

I think it does it after it’s been driven and it’s been sitting like 4-6 hrs , not sure if it does it if it hasn’t been driven !

 

Shit. At first, I thought someone placed a ticking bomb under my truck ...LOL
I understand that it's doing some kind of testing if that's correct. But you should not be able to hear it by walking next to the ruck. Stupid ....

 

It's how the aliens track you. Heh.