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on my 4 way splitter, one goes to the carb, which is the vacuum source, one is capped, one goes up to the fuel petcock (I think) and the last one is a separate hose I added which runs out to the side panel so I can check the carb sync easily.
you should at least have a hose that goes to the back of the fuel petcock off a 3 way splitter. do you?
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