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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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