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 - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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