Early 1940 machines were fitted with the pre-war type of dull-chromed copper piping. The feed in particular is an odd size as the tank filter has a 5/16" fitting and the engine is 1/4" which requires a nipple which sits inside the lower end of the 5/16" pipe rather than outside.
There was a D.M.E. circular dated 24/2/41 detailing fitting of flexible petrol and oil pipes 'as necessary'. It is likely that production had been amended prior to this but on the UK contracts the spare parts lists didn't catch up until contract C10217 / W45001 but it has long been evident that the spare parts lists were type-set some time prior to production.
I suspect that yours would have had the rigid copper type.
What we really need is for someone in Australia to find a spare parts list for the Australian contracts !
