It had a large amount of black particles on it. My kenworth ended up with black sludge and I bought a case of stuff to dissolve the asphatines and took about 5 filter changes for it to clear up. This is not near as bad.
Are you asking about the nylon fuel return lines if so wes at classic diesel designs sells fuel return line kits and all those nylon lines are just covered rubber i had been searching for the same thing cause i wanted the nylon fuel lines n they seem to be rare to find that n i am a purest for vehiclesdoes anyone here know about these nylon fuel line connectors Ford uses? I remember a year ago I found a website about those, all explained (4 different models) and you could order them there. but of course, forgotten.