Diesel pumps in the US aren't really standardized, or at least they didn't use to be. When all gasoline was leaded, diesel (for cars) and gasoline used the same size nozzles. When they came up with unleaded gasoline, they used a new, smaller nozzle, so that unleaded only cars could have fillers that only let the smaller nozzle fit to exclude leaded gas. But cars built for leaded gas had a larger opening and could take either nozzle. Diesel kept the larger size fillers, because all the existing pumps used them. Since they the larger filler, it was no big deal to put an unleaded size nozzle on a diesel pump --- it still fits in the car, and it's got a green cover, the international sign of not default fuel.
So, I had a 2011 VW Diesel, and before the emissions scandal, they had some fuel issues that they were blaming on gasoline in the fuel system, and so they sent out stickers to the registered owners to put around the filler that said 'hey --- diesel only', and that didn't solve the issue, so they sent a contraption that made it hard to fill with an unleaded sized nozzle. With that contraption, I found one of my usual stations was using an unleaded sized nozzle for diesel. So I stopped filling up there, because the contraption was designed to never come out and it takes a long time to fill up when the contraption opposes your nozzle because it's too small. I imagine that station eventually figured it out and put a leaded fuel sized nozzle as I think other manufacturers rolled out similar contraptions too. Gasoline ruins diesel fuel systems rather quickly, and it's not too hard to be distracted and misfuel.
Of course, truck stops have even bigger nozzles for diesel to go in big rigs and other sizable vehicles.
As they should, they're British Petroleum, right? All their pumps should be standard across the world, and in England, the custom is the diesel is default and 'petrol' is not.
So, I had a 2011 VW Diesel, and before the emissions scandal, they had some fuel issues that they were blaming on gasoline in the fuel system, and so they sent out stickers to the registered owners to put around the filler that said 'hey --- diesel only', and that didn't solve the issue, so they sent a contraption that made it hard to fill with an unleaded sized nozzle. With that contraption, I found one of my usual stations was using an unleaded sized nozzle for diesel. So I stopped filling up there, because the contraption was designed to never come out and it takes a long time to fill up when the contraption opposes your nozzle because it's too small. I imagine that station eventually figured it out and put a leaded fuel sized nozzle as I think other manufacturers rolled out similar contraptions too. Gasoline ruins diesel fuel systems rather quickly, and it's not too hard to be distracted and misfuel.
Of course, truck stops have even bigger nozzles for diesel to go in big rigs and other sizable vehicles.