It will not harm your engine in anyway. It will probably not run for long due to the very high heat value of diesle fuel your plugs will not be able to ignite the diesle.To get the diesle out, the best thing to do is drain your tank and either crack the injectors and bleed the diesle in your fuel pump out or just run the little bit of diesle that is left in your fuel pump(this will not hurt anything). Now you probably would not have to change your filter because all that does is filter the dirt ect. out. The dielse can not hurt your filter.Diesle is a fuel also. It isnt like running water through your engine. Its almost like running a really high octane gasoline in your car. So to save you some time just drain your fuel tank. Fill back up with gas and crank your car till it starts again.