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So does my 57 and I have tried two vented caps to no avail. Took one and drilled two holes in either side and no more pressure.
1955 T-Bird
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Gas Cap Tech Tip: The gas cap on your T-Bird must be vented to allow air to enter the tank. If air cannot get into the tank vacuum will be created which can stop the flow of fuel to your engine. Last summer, I had to replace my gas cap and I discovered that when I removed the gas cap after running the engine for a while, I could hear the sound of air rushing into the tank. To vent the fuel tank, the 1955 and 1956 gas caps have a rib stamped into the surface which allows air to enter from the outside edge of the cap to the center. The problem with my gas cap was that the inside diameter of the gasket was so small that it prevented the venting process. The problem was easily fixed by removing the gasket from the gas cap and increasing the inside diameter of the gasket by cutting it with a razor blade. Removing just a little bit of the gasket from the inside diameter corrected my venting problem.
