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About the only way you can prove it is if you buy gasoline at the same station every time. I have heard of people getting repairs done when the truck driver screws up and mixes diesel and gasoline tanks at the station.

Yeah, I've heard of that too. Never from too much "dirt" stirred up in the bottom. Again, filters are on pumps for a reason, to prevent exactly the premise in the original post.

Oh and one more thing, the shutoff for the gasoline is in the handle. Holding the hose up does exactly zilch to get more gas out. Back in the day it was true but no longer.