Copper Fuel Line - 8mm internal or external diameter

[Dave85chim]

Morning!

As the title suggest - Im replacing the copper fuel lines and just wanted to know if the 8mm diameter refers to the internal or external diameter?

Also, im presuming nothing special on the copper pipe itself just standard?

Regards,
Dave

[Steve_D]

8mm OD
Cunifer pipe would be better than standard copper as it is more resistant to vibration fatigue.

Steve

[caduceus]

Agree with above. Cunifer is what you're supposed to use. It's a bit harder to work with than standard copper but it's more durable.