It use to be that you had to worry about putting gas into your diesel tank. Not so much diesel fuel into your gas tank, due to the fact that the diesel nozzle does not fit into the gas tank fill hole. That being said, there is a new problem out there facing Ford diesel truck owners that allows one to put DEF fluid into your diesel tank? Just take a look at the picture. The chance of this happening to you is real. The pain is real! The money needed to fix it is real! And Ford is not going to warranty the repair if you make this mistake. Owner beware, espically if you drive a Ford. Let me know what you think below.