Im gonna replace the lines for my 2000 blazer from the transfer case to the vacuum actuator under bat, how much line should i go ahead and get and what inside diameter, the lenth is hard to measure the way this stuff is routed. i dont want to make anouther trip so thought i would ask. by the way my heater door isnt working right how much line might i grab for that one.

 

just take the a piece with you, as far as length get more than you think you need...can always make it shorter...

i believe 1/8 and 3/16. i think autozone sells it in 10' lengths for a couple of buck.
i just got one of each on those and had a little extra...hope that helps ya out.

i was able to replace all the vac lines with that.