Metal fuel line from vacuum tank to carburetor - technical question

[29UJohn]

Does anyone know how the line from the Kingston vacuum fuel pump to the carb was shaped?  I put in a stainless steel line with a loop in it to allow for some vibration, but the vibration still caused the fitting on the fuel pump to loosen. I have used a modern flexible fuel line successfully for years, but I know that was not used originally, but that a rigid metal line was used.  Given that the engine vibrates some, how was that line shaped and connected to prevent the firings from getting loose?

[chetbrz]

John, I can't verify the exact configuration of the fuel line, but I believe you had the right idea with the strain relief loop.  Unfortunately using a stainless steel line might be your problem.  Stainless is to stiff. Same setup with a copper alloy line may work better.

My 2 cents

[29UJohn]

Chet,
I agree, and will try it with copper.
I had purchased a stainless steel alloy line that was supposed to be easy to bend, but I think it is still too stiff. Not sure what was done originally.

John

[Touring29]

I am late to comment on this but since none of us were around in 29 who's to say that the rigid line didn't cause problems back then? I would think that eventually it would crack at one of the fittings from the vibration.