Its on the front of the fuel bowl left front and the handle is yellow .I think Bob at dieselsite sells the oring kit if not he can get you them pretty cheap . Ford is like 80.00 bucks. Bobs # is 888-414-3457 .I just replaced them on a 97 stoker
Just don't let the stealership fix it they will bent you over. Told me that I couldn't do the o-ring kit on the fuel module myself cause it involved the fuel system oh well .
It's a common leak that I think is gonna get even more common with the new fuel. SOmething tells me those old o-rings aren't gonna like this new fuel too much.