I don't think anything is wrong, but I'd like to know what it is.
Yeah, it's been making the sound since Day 1. No variations in pitch, tone, or duration. So I think it is a normal operation sound.Black Dragon,
unlike the others I think something is going on within the door! Has it been making this sound since you picked it up? I have a 20 2LT Blazer myself and have owned several other GM vehicle with the same lock and handle assemblies and have never heard what your hearing. I don‘t believe it is a fuel pump I think it is a mechanical movement within the door. Good luck with your investigation and please post the outcome.