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Hey yall, I have a 2000 GMC sierra, Recently its had a quiet high pitched whine on start, and gets louder after 10 or so minutes of driving. Whine will still be there when its put into park. I thought it might have been the fuel pump, so I changed that a few hours ago and the quiet high pitched whine is still there. I havent been able to drive it to figure out if the loud whine is still there as I wasnt able to get the lock back onto the fuel pump to drive it, its being stubborn and wont twist all the way on, only halfway. I read that it could possibly be a vacuum hose, and to take of the fuel cap while the vehicle is running and see if it disappears, which the whine did not go away. Anyone got any ideas?

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Update: I got the lock back onto the fuel pump, and drove it around for a while. Loud whine is gone, but quiet whine is still there. I managed to get a video of it.

Had to upload to google drive, video is too large to post directly here.

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