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Mike, I'd say your cap is defective. Why have a spring loaded gasket seal if the vent hole is open all the time?
Bill
Being a 1960’s car with no emission standards, that the vent in the cap is just that, a vent. Neither holds vacuum or pressure. I would think the gasket was just to prevent fuel from sloshing out.
found at https://www.tanksinc.com/index.cfm/page/ptype=results/category_id=160/mode=cat/cat160.htm
Up through the 1960's, most vehicles used vented gas caps. This is simply a gas cap with a hole in it. Unfortunately, this hole would allow the fuel to splash out when accelerating or turning a corner.
Now, if we could only get you to do the same test with a series 1 cap . . . .I just did a simple test on a spare series 4 complete gas cap assembly I have. I used a syringe and a small rubber grommet with a hole in its center. The grommet was used to ensure an air tight seal between the syringe and the gas cap. Moving the syringe will attempt to pull or push air through the vent hole in the cap. The result was that air moved freely in both directions through the vent hole without resistance. As a control, I verified the syringe plus the grommet mated to a solid surface resulted in not being able to move the syringe in or out.no
Mike
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