Today I was out fiddling with the engine compatment and I accidently yanked on a vacuum line and it snapped like a pretzel, it's was cold out today. Anyway I managed to splice it back together with a piece of rubber emissions tubing. My question - is the color of the vacuum line related to the inside/outside diameter of the tube? The one I broke was yellow with a blue line. Seing how brittle it was makes me think I should start to replace some lines. I'm sure there is some kind of specs. on these color codes, just havn't run across it anywhere. Any thoughts on this? Thanks