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That may be a reference to the fuel tank vent line that connects to somewhere around the throttle body assembly on the intake manifold. It has similar connection like the crank case breather line connectors. That is one other thing that needs to be disconnected if you want to remove the intake manifold completely.
The other page on the right at Bentley Manual talks about the fuel tank vent line but on the picture there on the other page they show wrong connector as fuel tank vent. Also just noticed Bentley Manual is saying to remove the fuel rail for intake manifold removal, absolutely not necessary.
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