Have you checked to see that the fuel tank breather is not blocked. I have come across a similar fault where the breather was a small hole in the filler cap which had been blocked with paint, after running for a while you get a vacuum in the tank and no fuel!
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Mike Gurr
1944 Matchless G3L
1944 No2 MK2* UC
10 CWT GS trailer
1944 BSA M20
Royal Enfield RE125 'Flying Flea'
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