Where does this go? v. 2000 Subaru Forester 2.5

So my buddy has a fuel leak, and this is the picture he sends me. My father has no schematic’s at Auto Part Intl. except a crappy exploded pic with little detail… Turning to NY Speed to see if they can lay some advice out there…

What part:
Where does this go:
Possible resolutions:

That’s the fuel supply line, the one with the blue stripe is the return from the FPR up at the engine likely. Think they hide up in the body on those… not under many subys. Going to have to try to get that end off, go up in the car, and get a replacement male quick disconnect end to go into the line, and attach them with either a compression fitting, or flare and use a union, or run a new line external of the rail. Couple ways to go about it. All I know is that junction needs to go away since it’s leaking.

Thanks for the tips. I think he will need to find out whats beyond that grommet and where that goes or comes from.

That goes under the rear seat. Remove rear seat and go to town. Fixed a few of these in my day.