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 - Antique Tractor Solvents - by Curtis Von Fange. Solvents play an important role in keeping our tractor clean and running efficiently. There are many different types that can be used for external and internal cleaning of the various tractor parts. Being aware of the different types of solvents will make any cleaning job go easier because one can select the correct cleaning agent for the task at hand. Let’s take a quick look at what is available and readily used in the solvent larder of our shop environment. The most universal solvent in
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