What is this vacuum line for?
 

Putting my newly rebuilt engine in I noticed a line that I’m just curious what it is for. The car is a ‘62 Mercury Meteor.
It runs from a fitting up by the throttle cable, runs along the top of the intake manifold, then down to the power steering pump. I can’t figure out why a vacuum line would run to the PS pump.
What is this for?
Thanks

Re: What is this vacuum line for?
 

It is a CARB IDLE SPEED-UP VALVE (hydraulic).

Re: What is this vacuum line for?
 

Ah! Thanks!
In the 40 years I’ve owned the car, I’ve never adjusted or paid any attention to it. Now that I’m putting it back on my engine I was thinking “What IS this?”