IH Vacuum system Scout 80 (1 Viewer)

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Apr 15, 2018
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Virginia
New member and first post. 1964 Scout 80 4 cyl 152ci. I don’t understand the assembly with the Tee on the intake manifold the bottom has a brass piece with a hose going to the crankcase and the top of tee has hose which goes to the fuel pump. This pulls a vacuum on both. What is the purpose? What is the brass piece on bottom of tee?
Why pull vacuum on crankcase, I thought you should have positive pressure in crankcase. Please help!
Thanks much.
 
Pictures?

Maybe I can look at my sons Scout 80 for you.
 

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