help neck filler

Hey there everyone! Been a hot minute since I've had to dust off the login for this place, But i figured having picked up a couple of my dream cars, I'd dust everything off (And get a account at the Longroof forums) So, I just replaced the fuel pump on my 96 Roadmaster estate wagon. Not a bad...

Just picked up a 2004 Buick from a guy on offerup. Has almost 190k. When I got it he told me the only thing wrong was that the driver side wheel bearing needs replacing and it needs a new "gas cap". I'm a young guy so I don't know too much about cars. I didn't see any warning lights. So I bought...