I have a pair of Optimus ranger 10. I have only tested one once because I was scared. I filled the tank with lighter fluid because this fluid is about the same as the kerosene sold at a higher price. At least that is what I have been told here in Norway. When I preheated the stove, I heard it start to boil inside the tank. I have never experienced this with other stoves I have used this on. I waited until the preheater had almost turned off and turned on the burner. I thought maybe the pressure would be going down. Eventually, lighter fluid began to spray from the safety valve on the fuel cap. It also boiled more inside the tank. I closed the burner again and left the stove until it had cooled down. It was incredibly scary. What can I do to avoid this? Ranger 10 does not have a heat shield such as 8R. Can it help to put on such a shield? Maybe I need to use biodiesel instead of lighter fluid? or the kerosene?