So indeed it is 5/16, I did a temp fix with the 3/8 line last night. There is another braided line coming off the barb from the fuel filter that was also leaking- I assume from having Biodiesel dripping on it from the split hose. I simply cut off about an inch and that seemed to cure it.

Is this the return line? The braided line runs underneath the engine cover, can't recall where that goes from when I had that cover off before.

I'll take a better pic once I get the 5/16 hose and brass 90 setup in place.

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1995 E300 diesel