I changed the generator on my Coleman 413H and thought that would cure the problem as the stove is 20 years old and has worked wonderfully all this time. I then took the burners apart and cleaned the burners and assembled them exactly as I took them apart. My fuel is probably 5 years old.
Re: having a problem with burners not generating .
So you have a yellow flame, not blue? my mate had same problem. He now uses unleaded, adding 10 drops Redex to a gallon. He was also told not to overfill the tank - just 3/4 full. Works much better but he says not perfect. Ian
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A complete new valve assembly isn't very expensive and you can often get one on eBay with a new generator included. It's not worth servicing the old valve given the safety implications of leaking fuel.
Do you mean unleaded? Officially no, unless it's marked "unleaded" or "dual fuel" (in Coleman speak, dual fuel means unleaded gasoline OR white gas) which means all the seals are rated for the additives in road fuel. Unofficially yes, but gasoline is not a good idea because it tends to clog the generator with soot, it goes stale very quickly and it smells bad. I would stick to Coleman fuel, Primus Powerfuel or Aspen 4. You probably don't get through so much of the stuff that cost is a big issue.
The pressure drops and so you have to pump it up a little every now and then. What I do is pump it up a hair. Reset the flames to a pretty blue. Yellow flame is too much fuel to air ratio. An air shutter adjustment is needed. Also dust in the burner can cause the secondary air to have an improper mix
Are you pumping the tank up all the way? I have the same problem if I have too little pressure in the tank. The instructions say pump 35 times. Try pumping 50 or 60 times- that seems to help.
Also, you can't light this one like an old 425. My old stove you could turn the gas on and then take a match neat the burner. For this stove, hold the match near the burner with the gas off and quickly turn it on.
These are two things that seemed to help me with the same problem.
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Is it possible that the part that screws into the propane cylinder is not opening the bottle all the way. This would alow enough gas to flow through to light but will not keep a flame because there is just not enough fuel flow. If this is the case you most likely can't fix it and need a new one. How old is it, if you can return it for a new one, do that, just to be on the safe side.
The connector for attaching the regulator to a disposable propane cylinder has a sintered bronze filter in the tip of the brass probe tube that is prone to clogging, or the bronze pellets get mashed down over time, restricting gas flow, and this will cause a portable grill or camp stove to perform poorly. The filter is so fine that it takes very good eyesight and bright light to see that it isn't solid metal, or use of a strong magnifying lens. The best solution is to buy a new Coleman regulator assembly. If you are unable to get a new regulator assembly and have the skills and the tools, you can try drilling a very small hole on the side of the probe tube with a #60 drill bit, just below the bronze filter, but near enough the end of the tube so that the hole will be past the plastic seal when the disposable cylinder is fully screwed into place. You should avoid drilling directly into the end of the probe tube, as the end of it is used to depress the Schrader valve in the disposable cylinder to allow gas to flow. A #60 wire gauge drill bit is only 0.040 inch (1.016 mm) in diameter, but makes a hole large enough to supply sufficient gas to a portable grill or a dual-burner camp stove. If you choose to perform this work, the probe should be unscrewed from the regulator body and the Schrader valve core in the probe tube should be removed before drilling. Be sure to clean all brass and bronze particles out of the probe tube before re-installing the Schrader valve core and the screwing the probe into the regulator. Use a removable-grade thread locking compound to secure the probe in the regulator body and don't over-tighten it, so as not to crush the rubber gasket. Allow the thread locking compound to cure for several hours before attempting to use the regulator. Keep in mind that this modification increases the likelihood of dirt getting into the needle valves and jets of your stove or grill, which can cause maintenance problems in the future.