Welcome to TheDieselStop
I can think of two things (well 3) that may be the cause of your leak.
1. The fuel supply line runs between the filter housing (front of the valley) to the back of the passenger side head. There's a bracket under the turbo pedestal that may have rubbed thru the fuel line. That's probably the worst case.
2. The connection at the rear of that line may be leaking. It's located under the turbo outlet pipe and uses a rubber ferrule to seal the line to the fitting on the head. It's kind of like a brass compression fitting with the brass ferrule, only the ferrule is made of rubber material.
3. There is a plug at the back and front of each head that closes off the fuel gallery in the heads. They're sealed by o-rings. Could be one of those has let go.
4. (OK I lied) Could be that the fitting in #2 above has cracked the head where it screws in (tapered threads overtightened). THAT would be the worst case.
Wadda they mean, not a diesel shop??! It's not a diesel specific problem, it's a LEAK!!
AND the Ford dealer is NOT the only place that can fix it for you. Other shops willing to tackle it (really most likely relatively minor issue) can do the job for a lot less than a Ford dealer would nick you for it.
It's even do-able by the reasonably skilled back yard mechanic.
Good luck, and post back for more info if you need it.
BTW, be careful about those videos. The guy has made WRONG statements in some of them. Generally good, but lacking in some areas.