I am just wondering which fuel disconnect tool I need to use here and how it is used. Thanx a lot

 

I used one from this set. They are not as nice as the aluminum hinged variety, but were effective enough. When I was opening it to fit it over the line, I thought it was going to break, but it did not. I believe it was 5/8, but I am not certain. If I were going to purchase another set, I would get these. All the best.