Fake news...mystery not solved.
Question: How many think that the images I attached from my scope appear to be a hose with a slit in it and fibers sticking out of where the hose failed? That's what I thought I saw...and no, I hadn't been drinking.
This afternoon I was looking at the Ford "fuel tube" assembly part #5R3Z-9J27-9A diagram and realized there were no fuel lines or any other hoses in the location that I thought I saw a hose. (BTW, that part number is one assembly that Ford doesn't make any longer.) I also checked another part of the fuel system in rear, part #5R3Z-9E325-A (This part is still available.) So, I jacked the car back up to get completely under the car to see exactly what I was seeing in the scope. I found the object again with the scope, left the tip pointing at it, then crawled under the car...and it was a seam, where it's stamped together and those "fibers" are tiny metal shavings at the stamp location. It just was an optical illusion on the screen, or maybe I was hoping it was that easy to find and seeing what I wanted to see.
So after I realized that what I saw on the scope wasn't a hose, I started the car for less than a minute to get it to leak again. After shutting it off, I got under the car to watch. It took a minute or two but fuel did start dripping off the driver's side of the tank, towards the drive shaft tunnel. I had my scope with me and started looking all over. None of the fuel system hoses or fittings leaked, at all. I had the back seat out and both access covers off over the sending units...zero leaks around the openings or at the sending unit fitting on the driver's side. I followed the Ford part diagram where all the fuel hoses are to make sure, no leaks.
Based on what I could see under the car with the scope, fuel is coming from the driver's side of the tank, towards the section that goes over the drive shaft tunnel. The only thing that makes sense is that the tank has developed a hole in it on top, so it leaks when the sending units come on...which makes no sense.
I've talked to my mechanic, owns the shop I go to, he said it's not likely that a hose rotted. The car has ethanol safe hoses and it's not old enough nor has it been in the weather enough to rot hoses. Rodents could have gotten it, however where it's leaking from on the tank, there are no hoses or fuel line connections and I haven't seen one mark that would indicate something has been chewing on the hoses.
I can't wait to get the car towed down to the shop to see it on a lift. I know where this is going, he's going to have to drop the tank...which means removing half the back end of the car and most of the cash from my Mustang aftermarket parts fund. Oh well...
Once I get it fixed I will post an update and photos.