As I posted elsewhere I had a tank made for the EK.
They used the thread for the fuel line to bolt into the tank out of the old tank. (Just cut out a square piece and welded into the new tank)
I went to bolt the fuel line to the tank and it doesnt fit. I think I remember a reducing bush from the fuel line to the tank itself but I'm not sure. The tank builder said if it had one he's lost it.
Im not even sure of the thread sizes I need to get another bush.
Any ideas? Thread sizes? Beer?
, there is a brass fitting between , I should have one here , but wont make any promises till I try and get it out , last one I tried I stuffed 
, just would not leave home , will get back to you .
, PM me your postal details and I will stick him in the post tomorrow for you