Volvo 850 size of vacuum line nipple on end of intake manifold

Post by **JimBee** » 16 May 2026, 20:27

I'm planning to replace that line that runs from the passenger side end of intake manifold, but not sure of the nipple diameter. Since I'm still driving the car I don't want to pull any of those lines due to concern about breakage until I'm ready with all the replacement parts.
I've got everything else—just not sure what I need to fit both ends of that small hose.

So ID size of hose that will fit there? 1/4"? 5/16"? Bigger, smaller?

Post by **abscate** » 17 May 2026, 03:32

I used blue silicone line on mine , I’ll check the diameter and report back. If I’ve got a spool I’ll send you some

Post by **jreed** » 17 May 2026, 05:43

I used blue silicone tubing too... thick wall. Memory is that it was 6mm inner diameter.

Post by **matthew1** » 17 May 2026, 09:07

3/16th inch or 4.8mm, see viewtopic.php?p=234116&hilit=hose+diameter#p234116

Post by **JimBee** » 17 May 2026, 19:07

abscate: That would be great. I took a rough measurement for length. The run from pass side of intake manifold across to the throttle body area and down to the PTC looks like about 4 feet.

Post by **abscate** » 19 May 2026, 17:35

Over in London for the week. My bad