Leaking fuel, need help

I just got finished replacing my head gasket and put it all back together. When I cranked her over she wouldn't start then I noticed I'm leaking fuel where the line connects to the rail back by the firewall. I pulled off the line and there's no o-rings or anything in it. What am I missing? Is it just an o-ring?

BTW it's 1990 xj with the 4.0

I think it's 3 pieces in there. The dealer has a kit with everything you need.