Right, those are the sizes of fuel line, it's a tubing that's got a nylon mesh in the laminated layer, not Tygon F-4040-A. It should be USCG A1 marine fuel line ideally but automotive fuel line from CT should be acceptable, IMO, automotive fuel line may not pass an marine inspection though, so if you plan on purchasing liability insurance it may become an issue.
The gray line on mine was all 1/4", the rest (5/16") was higher quality black line, so I only replaced the 1/4" lines and flushed everything well.
So, I think I used about 1 meter of 1/4", but you're going to need quite a bit more than that when you replace all the 5/16", I'd guess 4~5 meters of 5/16" is enuff.
I didn't reuse the Oteiker clamps, I used small gear type hose clamps on all of it as I went, although I almost used Herbie Clips instead. I had the gear clamps already on hand at home so that's what went on there, CT will have them.
Be careful when handling/removing the fuel lines ffrom the plastic nipples, the nipples can be brittle, so don't place sideways force on them or they'll snap off, hold the fitting while tightening the clamps so they don't break and don't tighten so much the nipples are crushed.
The fuel reserve switch valves are known to fail and start allowing air to leak inward or clog with debris, usually people just replace them, mine works fine still so I haven't touched it ecept to blow it out in all positions to be sure it flows well, and then I pressurized each section to make sure there were no leaks, such at the water separator cup or the fuel selector knob shaft, for instance..
