Siegfried - the Final Solution?

And here is the latest item in my carburettor war with Siegfried. He reluctantly starts on the all new carburettor, runs fine then cuts out and will not restart. On the 2nd new carb as now fitted there is no longer an overflow problem from the float bowl - the bleed hole at the top is now blanked off. Hooray. The problem lies in trying to defy gravity. The original carb fed fuel in from the bottom of the bowl. The new carb feeds it in from the top. The outlet spigot on the original fuel tap sits lower than the inlet spigot on the new carb. Hence the fuel pipe has to go in a circle around and over the top to meet the inlet spigot. I suspect that lacking a fuel pump this is causing an air block and stalling the engine. Thus at great expense this original but refurbed tap with horizontal outlet. My hopes now lie with this sitting parallel with the top of the inlet spigot thus needing a short length of fuel pipe with minimal uphill gradient. Who knows until I fit it if it works or not.