[nkaminar]

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To be honest, I would prefer a non vented cap and a pipe leading from the top of the tank to somewhere under the car or to the inlet to the carburetor or some other location. With the windshield open I get the gas fumes from the vented cap coming into the inside of the car. On my Model T I had a small diameter copper pipe leading from the top of the gas tank to the exhaust pipe before the muffler. It added a little pressure to the tank so that I could go up steep hills. Plus, the exhaust gas, being free of most oxygen, was safer than having air in the gas tank. There was a coil of the small diameter copper tubing so that any exhaust gas was cooled before it got into the gas tank. The gas cap was sealed and had an O ring gasket.