Sounds like the 2nd vent was a "Add-On" at some point in time:
The vent in front is larger and feeds a vertical rubber hose "standpipe" with a filter as a baffle, but not otherwise protected against fuel flowing through it.
When Pontiac Engineering went from the single vent next to the filler tube on the tank they then went to fuel tanks that had multiple nipples on the tank and went to a "vapor liquid separator collection box". Evap gases from there went to the carbon canister.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
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