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I was looking at what I can only assume is a fuel pressure regulator (00 M900). One large hose in, one out (one on the side, the other on the bottom). There's also a nipple up toward the top of this thing, that has no hose on it. On a car, id say this would be the vacuum source for the regulator. Only, this has no hose on it. Should this be open to atmosphere? I looked around and didn't see a vac. hose thats the size to fit this nipple. Don't get me wrong, the bike about tears my arms off if i want it to, but this strikes me as odd. Anyone have any input?
Kevin
Kevin