For a lot of years, JetCat said no to diesel. A few years ago they said "okay". I've been messing with JetCats for the last several years, JetCat has since removed the approval to run diesel and in my experience with the models I've given away (I'm old, Estate deal) the JetCats WILL NOT like desel) in fact, this guy I gave the models to cannot even get them to run owing to a change in field elvation and the fact that he INSISTS on buying diesel because his Jet Central engines and KingTech engines will run it. The JecCats will NOT play with diesel, at least low sulphur USA diesel, which is not nearly as good as the Europeans have available.