For air to be drawn out, air has to be drawn in. Yes, you should have the vent line from the intake hose to the filler tube. Perhaps your jeep has a different vent from a CJ? Seems to me there used to be a tube hanging from the side pan on the CJs, and I think I recall seeing CJ valve covers with an inlet on them as well. It's been a lot of years since I dealt with the civilian engines mind you.
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