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Each carb bowl fuel reservoir area is vented, both cojoined by a single rail....the upper black rail between them. Centered on the rail a single smooth hose barb where the single vent hose attaches and routes backwards..to...I forget where.
DO NOT cap off the rail barb, must be open to atmosphere...with or without the long hose but ALWAYS free to atmosphere.
There are actually 2 vacuum hoses between the carbs and culminate at the top of the decel valve, 1 larger than the other.
Requiring tricky splitting to access, you want to make sure there are no cracks, breaks and are *tight* on their respective barbs = no leakage.
Before splitting, would be in your best interests to have 2 new orings for the fuel rail (the lower rail) IN HAND.
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