One large line goes to the gas tank vent, one large line goes to the intake manifold, usually with the PCV.
Depending on models, one more large line goes to the carb float bowl and last but most important a small vacuum line goes to the top round purge valve itself. This comes from the CTO valve on the intake manifold.
'Some' types, don't have the small vacuum line, they have instead the purge line to the manifold going into the air filter snout.
Here is a link on one of them:
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Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Brent Bogrees wrote: