Thats actually an inspection cover for the flywheel. The fuel is leaking down out of the valley of the engine, and going down the back of the block. Could be a bunch of things up in the valley leaking, so your best bet would be to clean eveything up, replace the small rubber lines under the fuel bowl, and then re-check for leaks.
As mentioned, it could be many things in the engine valley that can leak, but one easy one to check while it is running (on a 96-97) is the Fuel Restriction Sensor. It is located on the Fuel Pressure Regulator block on the driver's side of the fuel filter bowl. It will look like a pressure sensor with one wire (on a 97 it wire be the uppermost wire to the driver's side of the fuel bowl ... there are three). The FRS are known leakers! You can get a new one from Ford, but most folks that change their filters regularly just use a 1/8 NPT plug (just don't overtighten it and crack the FPR block). Cheers!
Just a little update.. I started putting Lucas injector cleaning in my tank, maybe 1 to 3 fill up ratio and that's when I started noticing the leak. After a week of not using it, the leak has COMPLETELY stopped. Maybe it was just a coincidence but I refuse to use Lucas in my tank now. Though I know a lot of people like it. I know longer recommend it.
Check your banjo line i think thats what its called it runs into the head i had one that leaked like crazy then stopped 6 monts later started leaking so bad had to have a fire truck come out and check it before i could tow it
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