If you have a diesel under the hood, you don’t want gasoline in the tank. Ford of Europe has come up with an Easy Fuel system to prevent smaller diameter gasoline nozzles from being inserted into larger diameter diesel filler necks. A mechanical diameter detector locks out the smaller nozzle so only the larger diesel fuel pump nozzle can be inserted.
Most of you wouldn’t do this but as diesels become more advanced and much quieter, less knowledgeable drivers could make a very expensive mistake. There’s no indication whether this will show up in the U.S. but it’s a great idea and I don’t know why this shouldn’t be introduced in all countries.
Ford’s intention is to isolate the danger of engine damage to all customers,” said Ford Fuel Systems Engineer Stefan Buro. “With the Easy Fuel system, we have developed a method for error-free handling, especially for the coming generation of quietly running diesel engines, where the only things customers notice are good performance and excellent fuel economy.”
The Easy Fuel system, with a patented mis-fueling inhibitor, consists of a sealed filler pipe insert and fuel nozzle locator that guides the nozzle to the tank opening. The insert contains a mechanically operated diameter detector which only allows the larger diesel fuel nozzle to be inserted into the filler pipe, and locks out the thinner gasoline nozzles. The system will begin appearing on Ford vehicles within two years following final testing.
source: Ford