I recently found this hose coming off the carburetor (I think it’s the carburetor ¯\_(ツ)_/¯). I am knew to the whole project car thing. I can’t seem to find the hose or where it connects on any diagrams on the web. I’m hoping someone can help me on here.

Here are a few photos:

 

We need a rats nest expert in here, stat!. Calling @ray green to the 1st gen section.

 

There's a vacuum diagram on the underside of the hood, drivers side that should tell you where that one goes. Otherwise there are lots of useful guides online as well as factory service manuals.

Short answer, I don't know exactly without looking at my car and seeing where that hose goes to (which I can do later but you will probably get a good answer sooner). Probably the farthest left nipple on the vacuum rack when viewed from the drivers side. I see everything else plugged in.

 

Here's the vacuum diagram for 81-85 12A cars. Take your air cleaner off and follow all the lines from under the carb. There is a black plastic spacer under the carb that all these hoses connect to.

 

Got the wrong one, will repost

 

OK, at first I thought it was the hose that connects to the 90 degree nipple on the front of the carb to the farthest left nipple on the rat's nest, the red hose in Max's diagram and the one I marked in the photo below:



But on closer examination of your first photo I can see the hose connects to the carb near the center and bottom of the carb, not the 90 degree nipple coming off the front, like the hose I marked in my photo does (you can also see this tube attached to the 90 degree nipple in your first photo).

So the nipple at the lower center of the carb where your unconnected hose connects is not a vacuum connection at all, it's the cold assist port used to squirt antifreeze into the carb on cold mornings. The tube would have run to a reservoir mounted on the passenger's side firewall near the windshield washer fluid reservoir.

If you don't use the car in cold weather you can just cap off the nipple on the carb (like I do here in Georgia) and remove all the cold start assist apparatus. Cleans up under the hood and one less thing to worry about.

 

Oh that silly cold start jug. Does he still need to cap off the nipple the hose goes to, to prevent a vac leak?

 

Not a bad idea Max.

 

Thank you all very much. I would have never found out what that hose was used for on my own. I will remove the hose and cap it off.

 

Thank you all very much I will remove the hose and cap it off.

 

No need for a cap. It has a spring loaded checkball to prevent vac leaks.