What are the vacuum lines used for?

impulse001

New Member
Jan 16, 2008
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New Jersey
The reason I ask is because two of the the vacuum lines on the passenger side of the engine were broken. I would assume thats how they have been since I bought the car, but I just saw it today. I am going to be replacing them all with new ones soon, but I was just wondering what they are used for since I never noticed anything wrong with the car. The broken ones seem to go to what look like sending units, would that be right?
 
pictures would help.

this might help you.

mustangFoxFordVacuumDiagram.webp