I never get sick of watching engine running videos!
What were you doing with the line 1/2 way through the video? Looks like you were blowing through it!
That was actually my step dad. He had it up to his ear to see if he could hear an exhaust leak (which he didn't). A trick he learned from being a mechanic for 28 years I guess?
This week I am going to take the gas tank out mainly to clean the interior out but also to see if it's still usable. Then I am replacing the rest of the fuel lines, rebuilding the carb, and replacing the brake master cylinder.
edit: We had a hose going to a gas can to run it this time since I haven't checked the tank yet.