You had pressure build up in the tank because the vent is plugged and as you used the tractor the returned fuel heated the air inside.
Early caps had the vents on the under side along the outer seam. There are a couple of places where the seam in not completely crimped. This cap was replaced with one that had a single hole in the top center. Current production caps have two vent holes in the top.
Diesels are more likely to plug the vents than gasoline engines and plugging of the vents is what caused IH to implement the free gas cap replacement program. There were cases like yours where pressure built up in gasoline tanks and when the tank was opened the vapors rushed out and resulted in fires. Diesel fuel is less likely to cause problems so they were not included in the free cap program.
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Today's Featured Article - Fabrication (Who Me? Make it myself?) - by Chris Pratt. First of all, what are the reasons for not fabricatin your own parts? Most judgements on what should be purchased rather than fabricated stem from: Originality - If the tractor restoration is to be 100% original, it is likely that you should spend the time and money to locate the component in the used or New-old-stock market. Since this can be extremely difficult, you may want to fabricate the item or purchase a modern replacement temporarily, but eventually, you s
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