Can also be sediment or debris in the fuel tank, same sort of idea as the blocked fuel filter but sucking up some debris into the pick up pipe. Weird though it sounds I had this on a modern Land Rover where following some accident damage repair the body shop managed to drop a Scotchbright pad into the fuel tank resulting in exactly the symptoms you describe. I had forgotten all about it until this thread!
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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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