Do Not Overfill The Fuel Tank
Over-filling the fuel tank can cause excessive flame on liquid fuel stoves. You should always fill a stove tank on a flat, level surface with the generator parallel to the table top. Do not tilt the tank while filling. Inside the filler hole is a short neck reaching inside the tank. The maximum fuel level should always be just below the bottom of this neck.
If the fuel level reaches up inside the neck or is enough to require you to tilt the tank to keep fuel from pouring out the filler hole, the tank is over-filled and the stove can flood when lighted. This will cause large yellow flames that will not settle to a blue flame.
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