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Chris, I'm manufacturing a version of an old breather system checker that Perfect Circle used to make. Its very simple to use. If the little ball goes one way, you've got vacuum, if it goes the other, you've got pressure. You should have slight vacuum regardless of engine speed. If you want to see a picture of my tool, check out our web site @mercymotive.com
P.S. I've made an early and a late version of the tool. Some web servers haven't updated our photos. The old style looks like a hockey puck with a clear tube on top, the later version is a laminated deal with a semi-circle channel in which the ball moves. Either kind works great. Chris Bogue
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