Coleman 533, flames under burner

Discussion in 'Fettling Forum' started by Mbd, Nov 15, 2019.

  1. Mbd Belgium

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    Hi everyone,
    I have a Coleman 533 has been in the garage for many (10+) years. I tested it today and it burns yellow on startup and heats up to burning almost perfect blue within 30 seconds or so. So far so good.

    Unfortunately, when I turn it off there are petrol vapour fumes curling around under the burner. I can light these and they form a small flame in the box between the burner and tank (the vapouriser, I assume). I'm wondering if there a seal in this area that might have aged badly? Can anyone suggest whether this is a terminal problem, or something that can be fixed? I would hate to throw it away, but a liquid fueled burner that leaks hot petrol is too dangerous for my taste.
    Thanks in advance to anyone who wants to add some advice.
    Michael
     
  2. mahobud

    mahobud Subscriber

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    Greetings--
    I suspect you might have a faulty o-ring in the shut-off valve. I had a quite similar experience with a 533. A new o-ring solved the problem for me.
     
  3. Majicwrench

    Majicwrench Subscriber

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    There is no seal, and no way for fuel to get into that box EXCEPT through the burner. There are small foamy thing in the box that might be for soaking up excess fuel? These stoves are super easy to flood, and you must follow directions perfectly. If it is burning yellow on start-up you are flooding it. These take a LOT of pressure/pumps and you need to pump em immediately after starting too---read the directions!
    Also, you need an ignition source right at burner BEFORE you open valve. If you open valve then fuss around trying to get something lit, stove is flooded.

    I learned these lessons the hard way, I had one that always flooded, yellow flames...was about ready to scrap it......done right they will fire right up and burn clean, and shut off cleanly too.
     
  4. geeves

    geeves New Zealand Subscriber

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    Either that or over filled. I got my 533 cheap because it had been overfilled and caught fire on the previous owner.
     
  5. pyro_P Australia

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    Majicwrench has nailed it. IMO, the 533 is a very under-rated stove.
    When turning stove off, it is not immediate, there is a (very) small flame & murmured sounds as they die out.
     
  6. milehigh United States

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    Typically, you will see a bit of a yellow flame at start up, until the generator heats up enough to vaporize the fuel and a proper fuel/air mixture is achieved.
    At shut off, there is usually some residual fuel in the mixing tube, and you will see that burn out within a minute or so. This again is very common, and not to be concerned about.
    If you need further assurance that no fuel will leak when storing in the short term (best to empty the fuel for long-term storage), simply crack open the fuel cap to relieve pressure in the tank.
    I hope this helps!