Noticed this line completely disintegrated and not connected to its fitting. Having trouble looking up what the line is called, it is located on the front side of the carb.

 

What''s the other en connected to? Really, just take that short piece off and go to a parts store. They sell rubber lines in bulk. Just match up the size.

 

That metal tube looks like the part that the rubber elbow from the MAP sensor connects to.

 

Is the connecting plastic/metal thing between the two lines a filter of some sort or just an extension (male to male) ?

 

Could be a check valve. Don't overthink it. Just replace the broken part.

 

If there is enough slack in that line, just pull the check valve out, cut the line, put the check valve back in, and use the piece you just cut off to reconnect it to the throttle body.

Otherwise, a quick trip to the parts store, and they can match up the line without any trouble. They sell it by the foot though, and it looks like you need about an inch or so.

 

That line gets very hard when it gets old, replace the whole thing. I bought 1/4" vacuum line for that, replaced all of the pieces from the connection you show down to where it goes into the intake manifold, including where it connects to the plastic line that runs back toward the cowl.

If you remove it from the TB or the intake port the old hose will break anyway. Just carefully cut the check valve loose from the old vacuum line.

Steve

 

I can see the picture now.

If I'm not mistaken, the OTHER end of that line goes to the brake booster; and you'll need that check valve in there so that you can brake when you have to panic stop during acceleration or other low-vacuum conditions.

(If I am mistaken, then best bet is to follow that line to wherever.)

But I'm with glenlloyd - your truck is old enough you need to plan on replacing ALL the vacuum lines because of your cousin and mine, Justin Case.

RwP

 

I popped the hood on my 94 3.9 and that metal tube has a vac line that comes off it and runs down the intake on the passenger side and back toward the firewall between the Valve cover and intake. The MAP sensor is to the right of it which I now see in the picture ! duh.. I saw nothing like the check valve in the picture, the vac tube on mine is that hard plastic stuff with the expanded plastic covering for heat protection. Its all about toasted. .
Also I guess my eyes are better this morning. You need a short piece of tube to reconnect that. I had to spray it and carefully use a flat screw driver to remove it from the TB when I did the plenum. I suppose I should do all my vac lines too. :/

 

I found this vac diagram and it looks like your line goes to or comes from the Evap Canister. That thing is an Orifice Check valve.
https://www.justanswer.com/dodge/0tq...ling-when.html