Fuel Pump ghost?

This morning I was working on something in the garage when
I noticed a buzzing sound coming from the truck. I went under the
truck and the sound was coming from the fuel tank area.
I cycled the accessory switch and the sound stopped.
The truck is 3 days old. so far this only happened once.
anyone else notice this?

 

i think you are hearing the evap system....

 

from the owner's manual.... page 9

Noise from under vehicle after turning off the engine

Approximately five hours after the engine is turned off, you may hear sound
coming from under the vehicle for several minutes. This is the sound of a fuel
evaporation leakage check and it does not indicate a malfunction.

 

ok, thanks for the info.
this sound lasted for about 8-10 minutes
before I located it. I just didn't want the battery
to be run down.