Brian - are you referring to the marine rubber fuel hoses or the metal lines that run between the fuel pumps and injectors? I replaced all the original rubber hoses two years ago because they had hardened over time and were an accident waiting to happen. These hoses are many standard sizes depending on what size hose barbs were put on the ends they connect to. Best to cut off a small section, then take it to a marine supplier who can sell you the USCG approved marine grade fuel line.

The metal lines are standard Yanmar parts. Depending if you have a 2QM or 2GM, these lines will be different. If you need these lines, call Meredith at Oldport Marine and she can look in the parts list to tell you the correct part number. Check this web link: http://www.oldportmarine.com/yanmar_parts.html

Before replacing the metal lines, see if you have the "banjo" end fittings with the copper washers. You may just need a new set of washers.