I see mention here about fuel contamination and JetA1.
In the days of real aviation safety publications (the ASD) there was an article regarding the refueling confusion with JetA1 of an aircraft with "Turbo" decals on the engine cowls. It seems as though the refueller saw Turbo and thought Turbine and delivered the wrong fuel.
I believe fuel nozzles and refuelling ports were 're-engineered' so that only the correct nozzle would go into the fuel tank.
tipsy