Here is the latest and hopefully final response all but 1 because it might not be fixed. I found where the fuel leak was comming from, the fuel line was not seated properly to the fuel tank fitting, then I found that I did the unbelievable and actually fitted it back to front which is why it was sitting right. So corrected the problem and the connection at the tank was cured but now a slow leak at the fuel tap. So I ahd a close look and there was a slight mark on the edge of the flange, not on the taper, and this must have been where it was seeping from. I bought some 5/16" olives and nuts the other day thinking I will simply make a new fuel line and fit that. WRONG! 5/16" fittings dont fit the 3/8" outlets and fuel tap sizes. See the original fittings are unusually POMMY in design and although 5/16" is the tube size the original fittings step it up to be 3/8" and I have no idea why.
So on the phone to the metal yards in town for some new 12mm brass rod to make a new fitting and sweat this on wrong again biggest in town is only 10mm which is too small. A little bit more thought and I was on the lathe making a new fitting out of mid steel. This went well and I soft soldered it in place then installed it. Still a slight leak at the tap but all good at the tank. So to finish the day off I went back to the brass fitting and soldered it back in place then fitted it all back together with some Stag Jointing Paste which claims is good on petrol. So it is now out there curing over night. I put a tiny amount in the recess of the taper and around the flange under the nut. Tomorrow will tell.
So the pics will show a rough soldering job but it works along with my termimesh inline fuel filter to stop rust from getting to the glass bowl and carby.
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