[QUOTE=Old300D;1241372]25 year old fuel lines will leak, and more so with biodiesel use. They should be replaced anyway, so if you plan to use biodiesel, use Viton lines. /QUOTE]

you can use stock lines, they are supposed to be changed every 3-4 years IIRC ..gives you the initiative to stick your head into the engine to change the fuel lines every 3 years if you run bio...