'63 40hp lower bypass cover hose

[baytonemus]

I'm replacing all of the hoses on my 40352D. The one that runs from an elbow on the lower bypass cover around to the pressure port on the fuel pump is unlike any of the others. It is reinforced and has a smaller outside diameter but I think it's 5/16" ID like the fuel hoses.

Is there something special about this hose? Is it possibly heat-resistant because of running around past the head and exhaust cover? What should I replace it with?

Thanks.