When I replaced my line, I used the thumb and forefinger of one hand to hold on to the stub while I used the other hand to pull at the line; so as to avoid streesing the "stub" and breaking it.

The "stub" comes fitted with every new fuel pressure regulator.

If you break it, no need to worry coz you could probably figure out a way to "custom fit" the line to the port of the fuel pressure regulator.

Cheers.