Hello all my late father had seven Petromax 834, two are working fine. By the rest of the lamps I have flame coming out from mental. I have clean the jet, fuel pipe, and pipe in side the tank. And also clean the a Generator group including the brass gauze in the generator group still no luck it Please help and advise me. Thanks for Nimal
Do you get a straight fuel spay straight up when cold? How does the mixing paddle look like? Looks like not enough fuel and/or pressure/heat.
Hello WimVe Thanks for. It is straight up for a minute then going all directions I also can’t figure it out . It has enough fuel but pressure reached 3. So I guess it has enough pressure as well. Thanks Nimal
Sounds like the jet orifice gets partially blocked once in operation, and that the lantern was not properly preheated. That happens if there are still small particles of carbon in the vaporizer which get flushed towards the jet with the liquid fuel. You must clean the whole vaporizer inside and also the brass gauze very thoroughly. The gauze helps to evaporate the fuel evenly and also holds back some of the particles. The pictures you posted look like a rich burn, which means too much fuel. That can happen if liquid fuel passes the jet orifice, but also when the jet orifice is partially blocked so that not enough air is drawn into the mixing tube by an unfocused/widened fuel jet. You should also turn the mixing paddle in the straight open direction.
Thanks you Martin K. I will make changes as you advised. and let you know. Thanks you and kind regards Nimal
Forgot to ask: do you use an original steel jet or a new 250cp brass one? You must make a pricker rod. I made one from an old needle rod, since you need the mounting for a needle, and bend the rod carefully 90 degrees. A new 250cp needle would work for both types, old and new jets. The steel old 200Hk jets would have s small copper roll of gauze inside the jet as an extra filter/vaporizer.
