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Air Pressure Sound on Unlock

Poppi

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Aug 1, 2023
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South Louisiana
Not sure if this has been discussed here, searched and couldn't find anything. Anyway, '21 TB 6.2L, upon initial unlock in the morning there is what sounds like air pressure coming from the rear area of the truck underneath. It sounds like air pressure is being released for only about a second or so. Is this the fuel pump? Does anyone else have this sound?
 
I had a similar concern but it was when I would park and get out of the truck. turns out if the truck isn't level it will engage the parking break by itself.
 

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