Quote:
Originally Posted by Joe's Garage
If I had this problem, and were using the later-style tank with multiple vents, I'd plumb all the vents together and keep them open. Good luck!
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I get what you're saying, but the 3rd vent is not needed unless the evaporative emission system is installed. Early '71's came with a 2 vent tank and no emission system. Later production added the third vent as part of the emissions control. '68-'70 and early production '71 all used the same 2 vent tank. Both were positioned on the passenger side.
Securely capping the 3rd vent (driver's side) does no harm and functions the same as '68-'70/ Early '71.
All replacement tanks for '71- '72 have the 3rd vent to eliminate early/late production confusion on ordering. If you have a two vent breather, you plug the unused vent on the driver side vent to match the early configuration ... or plumb it into the larger line. I just failed to secure the cap, my bad.