Vacuum line sizes
Thread Starter
Burning Brakes
Joined: Oct 2006
Posts: 800
Likes: 45
From: San Diego CA
Vacuum line sizes
Is there a list somewhere that shows all the size vaccum lines on a 1994-96 C4?? I am going to go through the whole damn thing and replace all the vacuum lines.
Racer
Joined: Oct 2012
Posts: 265
Likes: 5
From: Phoenix AZ
Yeah. Replace those with rubber hose. cheap at autozone or similar. Match up the inside diameter and you'll be good as gold. don't forget the ones under the plenum. Look at them wrong, and they break.
Team Owner
Joined: Sep 2003
Posts: 25,393
Likes: 2,741
The tubing was offered in harnesses that were already made up with no individual "bulk stock" available. I might try a medical supply house that offered maybe LDPE, PDFE in various colors to simplify your work.
Just to use for examples you could check the "tubing" link from here and see the choices offered. Get your verniers out measure and go from there. Check the LDPE - many colors. GM originally might have used stripes on their tubing to confirm routing. It generally wasn't just plain tubing:
http://www.tblplastics.com/
Just to use for examples you could check the "tubing" link from here and see the choices offered. Get your verniers out measure and go from there. Check the LDPE - many colors. GM originally might have used stripes on their tubing to confirm routing. It generally wasn't just plain tubing:
http://www.tblplastics.com/
Race Director
Joined: Aug 2000
Posts: 11,470
Likes: 764
- the vacuum lines in my 85 are in extremely sad shape, and just about everything needs replacing. after 30 years, or so, just touching them, and you'll get a black, powdery crap all over your hands. even the plastic tubing is pretty brittle, and just about everything is patch work. most likely, I match up sizes from samples taken off the car, buy 5 or 10 feet of each size, and spend a Saturday afternoon custom fitting each piece. probably only a couple different sizes were used, and standard automotive vacuum tubing should work just fine! 
Racer
Joined: Dec 2012
Posts: 347
Likes: 25
From: Rockford Illinois
You can get the vacuum line and connectors at Advance Auto, both hard and soft. I had the plenum off to do the injectors and if you just nudged them they broke, but it's not any more difficult with the plenum on. I just reused the existing connectors where possible and spent less than $15.
