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It is usually a drag race only way to draw vacuum. You need to sustain high flow rates though the exhaust, high RPM the whole time. Why do you want the vacuum pump, to generate negative crankcase pressure, or for power brakes?
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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