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That’s what I’m talking about. Priming petcock with artificial amounts of vacuum. That’s not realistic test. Rather leave vacuum hose connected between carbs & petcock and measure actual vacuum. Clue is giving it throttle seems to help. You get more vacuum with larger throttle. So two measurements we’re interested in is:
- vacuum to petcock at idle/low-throttle
- vacuum to petcock at high/WOT
These numbers would be useful data.
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