Fuel pipe diameter

[Steve Bryant]

I'm currently sorting out the items required to make up the fuel line from the shut off tap to the Bronze Zenith Carb on my AD type seven.  I need to order the copper fuel tubing for this.

So... is the tubing 5/16" or 1/4" diameter?  I'm thinking 5/16 but would like to get confirmation on this.  Would three feet be sufficient to include the vibration loop or should I get four feet?

Thanks for indulging all these basic questions.
Cheers,
Stephen

[AustinWood]

Available from A7 stockists

[Howard Wright]

Hi Steve

It’s 1/4” and as Jim says the Cherished suppliers stock it along with the 1/4” nipples and BSP thread nuts that fit the tap and float entry.

I seem to remember that 3’ was about enough for my RK but only just enough. Probably safer to get 4’.

Cheers

Howard

[Steve Bryant]

Thank you Howard.

[Dennis Nicholas]

You probably know that the vibration loop should be horizontal and not vertical like some you see.

Dennis

[Steve Bryant]

Yes I do, but I don't know the diameter of the pipe as it was originally.
Stephen

[Steve Bryant]

Can anyone confirm if the pipe is 1/4 inch diameter ?
Thanks,
Stephen

[Colin Cooke]

Hi Steve,

I'm very close to getting my car running, and I've been a bit naughty, fitting dash 4 aeroquip hose for the fuel hose from rear tank to mechanical pump. I measured the old copper pipe, which was around 3/16" internal diameter. Dash 4 hose is close to this (5.4mm ID).

Hopefully someone will confirm that this is the correct bore size.

All the best,
Colin

[Colin Morgan]

The outside diameter of the ancient copper pipe on my car is 1/4".

[AustinWood]

BSP, British Standard Pipe, threads are specified by the bore of the pipe. This can be a bit confusing.
I don't know if the Outside Diameter of the pipe is specified.
My guess is the bore is specified as that is the parameter that determines fluid flow through the pipe.