Noise from under driver's seat upon opening door?

[71GMC_3/4T]

I've had my 2018 GMC Sierra SLT for three weeks now.

I noticed there is a whirring sound that comes from under the driver's seat if I unlock it and open the driver's door.  It seems like it happens only after it has sat for a while.  It lasts maybe 3 seconds and sounds like a seat motor.

I have the seat position recall turned off as I am the only driver.

I don't have easy access enabled.

It may not be from the driver's seat, but that's where it sounds like it's coming from.

 

Any ideas?

 

Thanks!

[Racindave]

It’s ur fuel pump priming. It’s not coming from under the seat but from under the truck. 

[Mike GMC]

Low pressure fuel pump.  It's actually in the gas tank.

[brokenjaww]

Fuel pump priming prior to start up? If you close the door and open again and don’t hear the same sound, good chance that’s all it is - totally normal - my truck does it, so does the Ford at work...

[71GMC_3/4T]

Cool, Thanks guys!

That makes sense.

It just never lasted long enough for me to locate it, and it would only do it once.

[garagerog]

Forgive me, I'm old, and maybe have a warped sense of humor, but with these new vehicles when I read whirring sound, my first thought was hamsters in a cage. 

[Forace2018]

Glad that has been figured out, mine does the same and I been under it and found nothing.  Thanks for the explaining!

[Diverjer]

I noticed what looks like a fuel pump on drivers side right in front of gas tank.  I thought fuel pumps were pretty much all in the gas tank anymore.  Maybe that isn't a fuel pump, sure has hoses etc heading to tank.  Just got this truck and trying to figure everything out, not like my old Dodge that I knew every sound and part location. 

[davester]

It could be part of the evap setup.  My truck has the evap tank there, with tubes running to the fuel tank and the engine.