The bottom hex is a 14mm, but I would not use a box wrench. I would suggest using a wrench called a flared end wrench. Basically, this is what these wrenches are for so that you don't roll the edges.
If you can't get it off, I would suggest just cutting the line a little further back and then put a new flare line on it and connect it with a repair kit.
Here is a video on how to make these lines. This is for a brake line, but a fuel line is the same way.
https://www.youtube.com/watch?v=sO43p4ZFUiM
Here is a video that will help with this as well:
https://youtu.be/U0XdsQkq-b4
I attached the fuel filter info below. Please run through this and let us know what questions you have. Thanks
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Wednesday, September 29th, 2021 AT 6:02 PM