No the larger would allow better fuel delivery. The mechanical fuel pump uses suction to draw fuel up to it, then the pressure is from the pump to the carb. With the larger line, fuel would flow easier up to the pump. Even if you have an electric pump, mounted somewhere inline, the larger tube would allow easier flow. Try blowing thru a 1/4 inch line, then try it with a 1/2 inch line. Same principal.
Do you happen to have a link for them? I'd like to run stainless, but thru 4wd Hardware it is almost $100 per line. Are they any better in price?