Hmmmmm, are you aware there was a recall on the 2005 Forester related to the fuel system?
Here is a link to partial details:
http://www.automd.com/tsb/bulletin_b280490/
I'll be honest that I don't know if the bulletin I posted is even remotely related to your problem, but it might be worth investigating.
If there's not a connection, then you're probably out of luck and paying out of pocket for the expense. BTW, are you working with a dealership on this, or a local repair shop? That could also play a role in how much of an expense you're working with.