A friend brought along his Svea 123 with a mini-pump and was going to start it up. First, he pumped it a time or two, primed it with a couple of drops of fuel, then lit it. It died out. Then he pumped it several times and primed it with a good squirt of fuel, then lit it. It died out. Then he pumped it a lot and primed it with a couple of spoons of fuel, then lit it. It started up, overheated the safety valve in the mini-pump, and then we had something that looked like a Saturn V rocket launch. The pressurized flame was shooting out diagonally, and another flame was shooting up past the top plate. The friend didn't quite know what to do since we had no water or anything to smother it with. So, I just kicked it over into the sand and gravel, and it was extinguished in no time. Needless to say, we got our excitement on that trip, but the Svea 123 was never seen again. As it turned out, probably all he had to do was to replace the cap with the safety valve.