Mine has the plastic gas tank vent
1969 Chevelle Assembly manual page 148 shows the plastic vent as "tank-fuel vent surge"
My 1969 Assembly manual only shows the set up with the plastic vent
I only have a 1969 Assembly manual so I'm not sure about other years. It only shows the set up with the plastic vent.
I'm not sure if there was a late design change or something not shown in the 69 manual?
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