Do I have a small leak? Coleman 530

Discussion in 'Fettling Forum' started by Mycroft Groks, Feb 10, 2020.

  1. Mycroft Groks United States

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    I've been playing around with my 530 I recently bought. I put on a M1950 pin, generator, preheat cup and burner. The generator and pin are unused extra parts I had in a M1950's pump handle. I have tried to light this and run it periodically and the first two times, it ran fine. I'm having a hard time lighting it now AND when I remove it from its carrying can, there is a slight amount of fuel on the bottom of the aluminum can and on the defuser plate. I can't see any fuel leaking out, but I did notice a little fuel on the bevel under the fount. I did fill it a little before I put it away, could it be just spilled fuel or do I have a slight leak? As far as I can tell, it did hold pressure while stored.
     
  2. Duck

    Duck United States Subscriber

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    Take it out of the canister and clean it of any fuel on the tank. Then put it on a piece of card board. That will show if it’s leaking. Also I had one that I stored in its container it built pressure from the heat (California summers) and it seeped out of nipple from a not completely tightened valve.
     
  3. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    Following a change of parts with the originals. Just curious, but why did you replace them?

    I’ve a 530 and a couple of M1950’s and I’m unable to check right now by dismantling but I wasn’t aware that an M1950 generator matched the joint taper on a 530 riser tube? If there’s a failure to seal perfectly there’s your fuel leak with residual tank pressure and air leak during starting, with consequent disrupted fuelling.
     
  4. Mycroft Groks United States

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    I replaced the generator, nut, pin and burner because the old generator was stuck on the old burner and in my attempt to remove it to check the nozzle, I bent the hell out of the burner. A M1950 burner will not thread into the 530 genny, but the M1950 genny will work on the 530 if you change out the pin as well. Old Coleman parts state this on their website.

    Plus now I have a preheat cup on the 530.

    In retrospect, I probably should have just replaced the burner with a 530 one when I got in my latest buy of two none working 530s and an incomplete M1950...but the genny and pin I put on the 530 was NOS and never used.. Plus now I only have to stock one generator and pin for both my 530 and my M1950.

    I cleaned out the fuel stem last night and fired it up.. no issues now, so it was probably just some varnish or a clog.
     
  5. Mycroft Groks United States

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    I've had it out for two days now.. wiped the outside down good, pumped it up and left it on some white cardboard. Came back two days later and it was still pressurized and there was no ring on the cardboard. I stored it pressurized and as you pointed out, temp could have been a factor. From now on, I'll store it depressurized and see if I notice a difference..
     
  6. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    @Mycroft Groks
    Pleased to hear it’s most probably sorted.

    Thanks for the update and clarification on interchangeable parts.
     
  7. Mycroft Groks United States

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    Put it back in the case, waited a day and there's fuel on the plate and container. I wiped it down and then put it back in with a paper towel around it. I'll open it back up in a day.
     
  8. Duck

    Duck United States Subscriber

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    Is there any fuel on the valve or generator? Or is it just on the tank? Put it back on the cardboard with pressure in the tank. See if you can see where it’s coming from.
     
  9. Mycroft Groks United States

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    It's just on the bottom of the canister and the plate I store under the stove. I can't find any fuel on the stove at all.
     
  10. ArchMc

    ArchMc Subscriber

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    Your description suggests a leak in the bottom seam of the tank. I would be a little surprised to have a leak there, but it's possible. I'm going to echo @Duck 's suggestion that you pressurize the stove with fuel in the tank, and set it on the cardboard to try and narrow down where the leak is coming from.

    ....Arch
     
  11. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    @Mycroft Groks
    A handy feature of a pump-pressurised fuel tank stove is that emptied of fuel and pressurised, dunking the whole stove in a bucket of water reveals the source of a fuel or air leak as a stream of small bubbles from the location of the leak.
     
  12. Mycroft Groks United States

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    No fuel on the cardboard or on the paper towel when I removed the stove from its container. I fired it up as usual and it lit fine. I DID notice a little drop of fuel leaking from the nut holding the generator on. I didn't thread seal it, so maybe that's where I'm getting the droplets of fuel.
     
  13. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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  14. Mycroft Groks United States

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    Ok... after putting the stove away pressurized for a few weeks, I opened the container to find a good deal of fuel had leaked out. I disassembled the unit and left off the generator, Burner and pot stand. I then pressurized it with about a quarter tank of fuel. I put that in the container and sealed it. After a few days I opened it up and saw streaking around the filler cap and alittle fuel in the container. I swapped out the filler cap for a one piece unit that is new. I pressurized it again and put it in the container. When I took it out, I noticed the same thing.. fuel in the container and streaking around the filler cap. I'll be dunking this tank in a vat of water in the next few days to see if I get air bubbles..

    Any ideas?

    I also picked up a Canadian 1947 530 the other day. After taking it apart, I noticed the fuel stem is broken near the bottom and the check valve won't seal. I'm currently soaking the valve in lacquer thinner to see if I can dislodge the ball. If not, I'll need a new valve. Can I use a standard coleman NRV for this? What about the fuel stem? It's only missing about a cm or so off the bottom. Do I just use it anyway or is there an easy replacement for it?
     
  15. William Ritchie

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    I have 2 ea set up the way you do with m1950 burner parts . 1 of the stoves I have leaks slightly with the same symptoms as yours . I may be wrong but I believe the font is assembled with a gasket in the bottom crimp and is not soldered . and doing the same as you , found that with time and pressure that gasket leaks ever so slightly . I no longer store fuel in that particular stove but have seen no reason to not use it due to the VERY slow leak . If you haven't already replace the cap gasket with an O ring of proper fit , as I am sure everyone here has done before . Good luck with it . The leak is bothersome but not a safety issue as I see it , have used on multi day car camp trips with no visible fuel or smell between uses .If you use the canister pots for cooking / boiling make sure to clean any contaminates before use . They are a cool old stove as I see it . WR
     
  16. Mycroft Groks United States

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    I have replaced the filler cap gasket with a new one from the Lantern guy. He was gracious enough to even send me the screw. Both that one and the one piece NIB cap does the same thing.

    I originally though it was the bottom of the fount leaking. However, after wiping it clean, there appears to be fuel on the top/side of the fount near the filler cap.

    Looking at both my 530 founts, the one in question has a crimped bottom that does not appear to be soldered. The new one with the questionable check valve DOES have the bottom soldered. I'll take pictures tonight when I get home.

    I want to leave one in my car for impromptu trips or for heating up food/drink when I'm out tailgating. I feel apprehensive about using the leaking one. I hope I can figure this problem out soon. I have a m1942 that just arrived that I want to get situated.

    I HAD thought about sealing the tank with a fuel tank sealant. Only issue is with the check valve. It'd need to be removed to coat the tank. If the stuck open one doesn't respond to the thinner and needs replacing, then I'll remove the bad one, seal it shut with solder and put it back in so I can seal the tank.. I'm hoping it works.. my GF loves the look of the 530 and I'd like to put one in her kit for her. The m1942 is mine!!
     
  17. Duck

    Duck United States Subscriber

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    What does the rim of the filler look like. Not rusted? No nicks or anything to allow a leak?
    I’ve had to lightly sand the filler on a lantern to get it to seal.
     
  18. Mycroft Groks United States

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    No, no Nick's or anything.