[Sythest]

Check engine light came on, OBII said it's P0456. I replaced the gas cap but no luck. Took it to an independent mechanic to smoke test it.

He said smoke was coming out on the driver side near the top where the fuel tank is. It's sealed off though so he is unable to access it. He told me another guy came in with the same problem and that guy had to drop the fuel tank out himself and sealed the nipple that's molded into the fuel tank. He wont do that because it's a liability issue so that leaves me 2 options, buy an entire new fuel tank and pay the mechanic to swap it out or seal the leak myself.

Here's where I need help, I always look for videos first so I can see the process. I can't find a single video of an F30 fuel tank replacement, any advice? Also, has anyone had this problem before? If so, what did you use to seal that nipple to stop the leak? Thanks for your time and help!