Vacuum Hose Size

[bajajoaquin]

Anyone know off hand what size vacuum hoses I'll find under the hood of my '67 Imperial? The car starts like crap, has an off-idle stumble, and I think the carb is jetted rich to compensate for leaking vacuum lines. Because of my limited time to work on it, I've just lived with it.

But I'd like to get a roll of vacuum line, and start to go through and replace it as I work on other projects. I'm not in a place I can go to the car and check (I'm in Bangalore, India right now), but I did want to try and order some so I can get ready for a little scheduled time under the hood.

I want to make sure my vacuum system is up to par before I start messing with mixture. No sense in doing a bunch of work to mask the underlying issue, right?

 

[rexus31]

There was a lot more to the vacuum system other than what is under the hood. The AC switch is vacuum actuated as is the remote trunk release, if you car is so equipped. To answer your question, I'm fairly certain our cars used 1/4" vacuum line.

 

[bajajoaquin]

Thanks. Is it all 1/4"? I would have thought they used different sizes for different things, but then again, that's why I ask questions on this forum!

The trunk release is one thing that doesn't work, either. The trunk and AutoTemp are two things I'd like to have working properly. Getting after AutoTemp is more of a project than I can tackle in the near term, but it won't be made worse by having new vacuum line put in.

I don't have any real plan to attack it, other than putting on a vacuum gauge, and tracing lines. I'm not going to try to get to them all at once, because that's also more of a project than I have time to go after. But like with the rest of the car, I'm hoping to make some slow, steady progress.

Now that I think about it, maybe a good way to go after this is to try discrete jobs: replace the line for the trunk release. Then some other system. Then another.

We'll see.

 

[MrMoparCHP]

When you get back do the simple test, pull the AC line and cap it and see how it runs.


Alan

 

[bajajoaquin]

The vacuum line to the AC, right?

(about a third of the way back. In Dubai right now)

 

[MrMoparCHP]

The vacuum line to the AC, right?

(about a third of the way back. In Dubai right now)

Yup, it should be connected where the power brake hose connects.


Alan

 

[bajajoaquin]

What is the expected result, and what does it tell me? If I pull it, and it runs the same, then I have lots of vacuum leaks... If I pull it and it runs totally worse, then the problem is not vacuum leaks? If it runs only a little worse, I only have small vacuum leaks?