If you put unleaded gas into a diesel car, it will damage the engine considerably and you will have to change it . Considering the cost of replacing an engine PLUS the high probability of the event occurring since diesel and unleaded hoses are often adjacents : why the unleaded hose isn't blocked automatically if it reads diesel car on a simple RFID tag located on the car ?
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In some cases they are -- there are mis-fueling flaps that prevent insertion of incorrect nozzles into the car.
In general, diesel nozzles will not fit into unleaded gas nozzles due to being the wrong size. There are attempts to keep unleaded gas from going into diesel nozzles with these flaps. https://static.nhtsa.gov/odi/tsbs/2014/MC-10124720-9999.pdf
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