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Gas cap question


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On my 1971 Avanti II, I have the orginal gas cap. However, over the course of time, the rubber gasket has lost its suppleness and can't hold gas in (after a full tank fill up, the gas will leak out and you will see the streaks of gas on the rear fender area....and no, I don't fill up to the very top of the tank stem)

I am looking for a replacement cap. I believe this cap was made by Atlas and has "Pressure Vacuum". While looking on Ebay, I have found Atlas caps that look like my original but have "Anti-Surge Vented" on the cap. What is the difference? Would these be a good replacement?

Also, are there ways to attach a new gasket on top of the old one? What have you done?

Thanks in advance!


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