im referring to the braided fuel hose that attaches to copper pipe with screen at tank?

I think it is 9.5 mm If it is braided, it might be original!

While you are in there consider replacing the plastic tunnel fuel lines with stainless steel ones. (Good Insurance)

Here is link:

http://www.tangerineracing.com/stainlessfuellines.htm

What year is your car?

73

For 1973 jawjaPorsche is correct. 9.5mm is the larger one (3/8 "). The smaller one is 8mm (5/16). Don't use braided cloth this time though. Use rubber high-pressure fuel injection hose.

also make sure it is rated for the ethanol in today's gas.