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Congrats!
The vacuum line is on the underside of the fuel rail, its 99% easier to get to it with the rail off. It connects to your vacuum tree, its a little plastic tube not a big rubber hose (at leased supposed to be, who knows what previous owner did..).
I don't know how long you've had the car, but its likely if the fuel filter hasn't been changed in so long (Volvo recommends 50,000 miles/change, I'd guess 75+ on yours, maybe even 100) I doubt your PCV has been cleaned in that long. To verify if it has or not (a good check either way) is to pull the dipstick out when the engine is hot and running and see if smoke is puffing out.. another check is if you get oil sitting on the top of your engine (it likely came out your oil filler cap..) If you have 5 or so hours you do the job and you get a bunch clean. Replacing a bunch of the components would be a good idea but if you're strapped for cash, blowing compressed air will do the trick for most of them. As always, broken/cracked vacuum line HAS TO BE REPLACED.
I can send you a PDF of how to to do that repair if you'd like (i don't know who free hosts pdf's or i'd give you that) or you can find plenty of links on this site, and matthews volvo site.
The flow back stopper that Klaus alluded to would probably help it start first time, although second isn't bad. I can't find a part number for you, sorry.
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