Generally, black soot stains mean the gas/air mix has too little air. If you have an adjustment for the air mix, open it up a bit. Also (don't laugh)- small spiders love to build cocoons inside these gas/air tubes. That really messes up your flame!
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Bolcked injectors and blocked burner jets . I would also check and see if you have a valve on the that might be not be fully on . All points to lack of gas pressure I would also check the reg on your tank or bottle .
Bottled gas reqires a different gas nipple, most new hopbs come with a set. Note that in the UK you need a gas safe qualified engineer to fit gas appliences to the mains. Not sure about bottled gas appliances.
Unplug the rice cooker and the remove the cooker kettle. Push the steel button in the center of the rice cooker to loosen the spring. Plug the rice cooker without the kettle, the cook function must not be functioning. Plug it again with the kettle and push the cook switch to see if it working properly.
depends on how old the trimmer is .. if its old then modern gas really messes with the fuel lines, primer bulbs and other rubber/plastic parts .. use only alcohol free gas in old equipment .. .. if its just a few years old then you may have a clogged high speed jet in the carburator or you could have bad gas (old) .. if its fresh gas then you have to clean or replace the main jet .. often you can remove the jet by removing the float chamber then a small filter . the jet is screwed inside a small hole usually in the center ... its tempting but dont use wire to clean out the jet .. if you scratch the jets precision holes then the mixture wont be accurate .. replair parts places often have a stock of jets .. also replacement carburators. to reduce the problem of jet clogging always drain fuel if the unit is not going to be used for awhile .. never try to use last years gas .. clean the tank once in a while .. and on old equipment dont use alcohol blended gas (most of todays gas) or replace all hoses filters and rubber parts with alcohol resistant versions .. (not easy to find)
Will the flame go out if you turn the control knob to the off position?
Sometimes gas cooking control knobs have two seperate types of control in the one knob. One control turn the gas on or off, one adjusts the variable quantity of gas allowed through a gap to your flame jets. Some control knobs can get gummed up and stick a little. The can be fixed by carefully taking apart the control knob, taking note of EXACTLY how everything goes back together and cleaning any gummed up bits. Then reassemble the knob and drizzle soapy water over the control to test for leaks. A leaky gas join blows bubbles and makes noise. Let me know if this fixes the problem.