Im wondering where this line goes? Since i got the truck a year ago it had a torn hose attached to it.

The vacuum routing diagram on the truck doesn't match whats actually there. Something is missing because after replacing upper and lower manifold gaskets i don see where this would go... The tree has some caps maybe there?

 

That's your vacuum reserve canister in the first photo. It's probably abbreviated as vreser in the vacuum diagram. One end of it attaches to the tree. I think that side is labeled "man" on the juice can.

The other side is labeled amp and goes off to wherever. It might serve EVR which is the the solonoid that controls the EGR valve.

It might go to Sol V ( Air B / Air D ) which is the air pump / thermactor system.

It might go to Sol V ( Air B) & Sol V ( Air D) which is a different thermactor setup.

Maybe the juice can serves as a reserve for all three ? The setups seems to vary.

You kinda have to study the vacuum diagram for awhile and figure out what all of the abbreviations mean. Then you can follow it up through and figure out what does what.

 

If what's there doesn't match the diagram then what's there is wrong.

 

One major difference now is that i installed an ac kit so the routing will be different.

Does the hose that attaches to the reservoir go directly to one of the solenoids or is there a "T" somewhere.

Anybody have pics of where this T might be?

Just call me sean, can u tell me the location where the reservoir line attaches to the hose that leads to the solenoid?

 

A/C doesn't matter, the routing is the same. It just goes around the motor and tees off at the solenoids.

 

Could you take a photo of your vacuum diagram and post it. Then we could explain step by step where everything goes.

The setups vary.

Like for instance .... they swapped a different motor into my truck a few months ago. The diagram on the hood is different than the diagram on the motor. What i did was take a photo of both and then compared the two.

On the hood the diagram calls for one vacuum reserve. That has three different things teeing off that one vacuum line.

The diagram on the motor calls for two vacuum reserves and no tees.

The vac reserve is there to provide a steady vacuum signal to the emission controls over a wide variety of engine operating conditions.

Most likely ... your AC vacuum line should just come off one of the nipples on the tree. ( Just like the other lines that go to your climate control system.)

It doesn't need to be plumbed into the vacuum reserve canister and will just steal the signal from something else that needs it to keep the motor running steady.

 

I have a 95 4.9 and it appears that you have an earlier model, but check this first. Both lines (should) connect to vacuum lines via couplers under the plenum. Both lines are run together from the couplers toward the back of the engine. Look between the first and second runners of the plenum next to your fuel rail and you should find where it broke off. You'll probably find an open vacuum line there with part of the coupler still inserted. This area get's very hot and the couplers degrade and break. Once you find the two lines, with the engine cool, you can pull them out from under the plenum between the second and third runner to give you enough slack to make the repair. Make sure that you hook them back up in correct order (In and Out) or you'll reverse the vacuum and throw a CEL and lose power at 35-45mph. I just relocated my vacuum canister and ran into this same exact problem. In this photo you can see the two vacuum lines in front of the valve cover running under the plenum. Check that area. My vacuum canister now sits below the washer fluid bottle because I wanted to clean things up under the hood, so don't let the picture fool you. My canister was in the same place as yours.

 

You were right it was sitting right there between the first and second runner. I didnt notice it because i was looking for a hose. Problem solved!

Thanks guys!

 

No problem!