How to take the middle fuel line off on a 2000 pontiac grand prix pump?

I've take off the outside two fuel lines, but I can not take off the middle fuel line. Fuel line disconnect tools wont work because there is just not enough room to insert them in. I press down on the sides of this fuel line pull and it doesn't come off as well. I have no idea if I'm doing anything wrong, this middle fuel line is just not coming off.