I've pumped maybe....200,000 gallons (just an educated guess) of diesel over the years, mostly at highway truck stops, often with tankers dropping their load. I can't remember ever seeing anyone stopping to wait for that. Had they done that, there would be unhappy drivers behind them impatiently demanding they move along. The busier fuel stops are dropping fuel almost continually, in order to keep up with demand. Only one time can I remember thinking I had a fuel problem, but it turned out to be an electrical issue. The sheer quantity of fuel being pumped tends to insure a fresh and clean supply. Jay