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I’m using 3/4 ID hoses and before that 5/8. Both sizes had no problem with vacuum flow. Leaks will reduce vacuum flow a lot. When I found that my passenger catch-can barely had oil, I also found that I had a leak at one of the connecting points.
Also are you in HI...wouldn’t this be summertime there? The winter is when you’ll find a lot of vapor/condensation.
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