It is normal for a.Coleman®. liquid fuel stove to burn with a large yellow flame when first
started. Until the generator assembly is hot enough to vaporize the fuel, the stove will burn
with a yellow flame. Once the generator heats up enough, the flame will turn to blue and settle
closer to the burner. Under normal use, this can take from 20 to 60 seconds depending on the
outside temperature. The colder the stove and fuel, the longer it will take. It is important to
have the lighting lever on the side of the liquid fuel stove's valve in the ""up"" position when
starting the stove and to leave the lever in the ""up"" position until the flame at the burner
turns blue. When the lighting lever is in the "up" position on the valve, the fuel mixture fed
to the generator contains less fuel and more air than when the lever is in the "down" position.
Running this lean mixture when lighting the stove allows the generator to heat up enough to
vaporize the fuel without building up excess fuel in the burner. If, after the flame at the
burner turns blue, you turn the lighting lever to the "down" position and the flame at the
burner turns yellow again, turn the lighting lever "up" for another thirty seconds. The yellow
flame indicates the generator is not hot enough. On both liquid fuel and propane stoves it is a
proper fuel and air mixture that produces the correct blue flame at the burner. On a liquid fuel
stove, outside air and fuel from the generator are mixed at the Bunsen where the generator plugs
into the manifold behind and above the burner. On the manifold, right behind where the generator
plugs in, there are two holes that draw in air to mix with the fuel on the way to the burner. If
either or both of these holes are blocked or if a spider or insect enters these holes and build
a nest or web sac inside the manifold, the fuel and air mixture will be incorrect and there will
be a large yellow flame at the burner that will not settle down to blue. On a propane stove,
there is, under the cook top, a tube that runs from each burner to the valve at the front of the
stove. Near the valve end of the tube are two holes that draw in air to mix with the fuel. These
holes and the tube near the holes can also be clogged by a spider or insect nest or egg sac.
This will cause a large yellow flame at the burner. For either stove, the solution is to run a
small bottle or gun-cleaning brush or some pipe cleaners up inside the tube to dislodge the
blockage and then to blow the Bunsen or tube clear.
Over-filling the fuel tank can also 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.