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Fuel suppliers should be forced to use the old square peg in round hole trick. I know diesel pumps are physically larger diameter, so it can't go into a gas tank, but that doesn't really work vice versa though.
mitt
The diesel pumps around here use different size nozzles depending on pump flow rate.
You can put diesel in a car, or gas in a diesel.
I think if people don't know what their vehicle runs on then they
should have the trouble and expense related.