1990 YJ 4.2 Firewall vacuum lines - JeepForum.com

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post #1 of 4 Old 07-14-2013, 08:25 PM Thread Starter
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1990 YJ Wrangler 
Join Date: Aug 2010
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1990 YJ 4.2 Firewall vacuum lines

On the drivers side near the brake booster are 2 vacuum that pass thru the firewall. Does anyone know what they are and where they are supposed to connect to?

Also, in the center of the firewall is a black vacuum line with a strange red fitting on it. Does anyone know what it is and where it is supposed to connect to?



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vacuum lines.jpg   4WD Firewall.jpg  
desotojohn is offline  
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post #2 of 4 Old 07-14-2013, 08:36 PM
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1990 YJ Wrangler 
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I think the bottom picture is the vacuum line that goes to the heater doors.

I could be wrong, but I think the first picture is the lines that go to the squirter. I'll look tomorrow when its light outside to make sure.
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post #3 of 4 Old 07-15-2013, 04:48 AM
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the larger one is squirter for sure
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post #4 of 4 Old 07-15-2013, 04:50 AM
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the second one goes on that nipple in the bottom of the picture that is behind the hose.

I don't feel like working on anything at this time so i sold my yj.
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