I filled my transfer tank yesterday, with 90 gallons of red died diesel. I removed the tank and set it down on boards. I don't keep it in my truck because of the extra weight. Walking by it a few hours later, diesel running out on the ground from the fill cap. Probably pushed out over a gallon from the looks of the wet spot on the ground. The tank is black, and real hot yesterday, and today also. I can see where that could be a problem, if someone orders 500 gal of warm diesel. It goes through the meter at 500 gal, when it cools you have a lot less diesel. Another thought you fill your tractor tank up in the morning, as the day heats up so does your diesel, giving you extra fuel. Is that possible? Next time I will not fill my tank so full. Stan