MSR gray pump won't shut completely off

Discussion in 'Stove Forum' started by montanafan, Jun 11, 2019.

  1. montanafan

    montanafan United States Subscriber

    Offline
    Joined:
    May 3, 2019
    Messages:
    51
    Location:
    Portland US
    Second post of the evening. When I use my MSR gray pump on my XGK shaker jet stove, It won't shut off. Keeps it at a small vaporized blue simmer flame. Is this something a few o-rings, etc can fix? My search didn't see a gray pump rebuild post. Pump originally came with my old Whisperlite, and I don't think it seemed to stay on. Don't want it to leak out in my pack.

    IMG_20190609_231106021.jpg
     
  2. snwcmpr

    snwcmpr Subscriber

    Offline
    Joined:
    Nov 16, 2011
    Messages:
    12,260
    Location:
    North Carolina
    It is possible to repair the pump if you wished, but, the new MSR pump is the recommended fix.

    Ken
     
  3. montanafan

    montanafan United States Subscriber

    Offline
    Joined:
    May 3, 2019
    Messages:
    51
    Location:
    Portland US
    Would prefer to fix. Stove was a $12 addition to my small collection. The Whisperlite is my snow melter on snowshoe campouts. Since I converted my WL to lindal, this is the only MSR stove that needs an MSR pump. Did some research, will look for micro cracks and replace o-ring on valve. Anyone have o-ring size info?
     
  4. snwcmpr

    snwcmpr Subscriber

    Offline
    Joined:
    Nov 16, 2011
    Messages:
    12,260
    Location:
    North Carolina
    I understand.
     
  5. OMC

    OMC Subscriber

    Offline
    Joined:
    Sep 13, 2013
    Messages:
    2,958
    Location:
    ILLINOIS, USA
    new subscriber @montanafan !!,
    Welcome fellow stovie,
    Fuel flow does not shut off. I can only guess that a failing o-ring is not your problem?
    IMG_3597.JPG
    I apologize if I tell you everything you already know.
    As far as I know your needle/seat valve has 2 functions regulate flow and on/off.
    You have probably already inspected it yourself as shown.

    The male piece: look at tip with magnifier, check for damage or if
    something is stuck to it.
    The female portion has a plain cylinder with flat bottom. Any debris in that cylinder is a problem.
    There's a *hole in the bottom of cylinder to receive the needle.
    Debris/problem might possibly be *inside that hole .

    Sorry, I've not had an occasion to clean / flush that hole myself and don't have suggestion.
    -----------------------

    As for leaking into pack.
    In the past you were able to keep pump attached in pack.

    Given this leak, outdoors (anyone correct me if i'm wrong) "you should be able to":
    close valve (simmer flame),
    hold bottle upside down, open valve (big flame), vent fuel from line, until only air comes out,
    close valve, promptly remove pump/releases pressure, put the cap on.
    thx omc
    (and I've gotta run btw)
     
    Last edited: Jun 11, 2019
  6. montanafan

    montanafan United States Subscriber

    Offline
    Joined:
    May 3, 2019
    Messages:
    51
    Location:
    Portland US
    Thank you very much for the fantastic explanation. Pic attached. Looks like my cylinder IMG_20190611_163134089.jpg may be split.
     
  7. snwcmpr

    snwcmpr Subscriber

    Offline
    Joined:
    Nov 16, 2011
    Messages:
    12,260
    Location:
    North Carolina
    Dang it. Too bad.
     
  8. OMC

    OMC Subscriber

    Offline
    Joined:
    Sep 13, 2013
    Messages:
    2,958
    Location:
    ILLINOIS, USA
    I confess I hadn't noticed that groove on mine when I looked earlier.
    I'm thinking it's normal? mine has same groove,
    and mine holds pressure / shuts off.

    That's an amazing pic you took.
    It doesn't seem like debris or damage to needle or seat (where the shutoff and seal takes place).
    That is what I was wondering when i commented but that is looking ok, there was nothing in there right? I'm stumped for now, sorry. Anybody?

    With valve stem out you can blow through it. You can shine light through from both sides, it's a simple needle and seat arrangement… :-k
    thx omc
     
    Last edited: Jun 12, 2019
  9. montanafan

    montanafan United States Subscriber

    Offline
    Joined:
    May 3, 2019
    Messages:
    51
    Location:
    Portland US
    Simple fix. Buy another MSR with a new style pump.

    Intent is to just have one stove of each type/category. How is that plan working out for the rest of you?
     
  10. Simes

    Simes Subscriber

    Offline
    Joined:
    Jul 26, 2004
    Messages:
    3,676
    Location:
    I'm on the way....
    Badly for most if I was to hazard a guess. Plus unfortunately there are also a lot of categories.
     
  11. snwcmpr

    snwcmpr Subscriber

    Offline
    Joined:
    Nov 16, 2011
    Messages:
    12,260
    Location:
    North Carolina
    No need to buy a stove.
     
  12. Jim Lukowski United States

    Offline
    Joined:
    Jul 13, 2015
    Messages:
    127
    Location:
    New Jersey, USA
    I couldn't find it on MSR's website so I called them. They still have the trade-up program for old MSR pumps. Send in your old one and they will send a new one out and invoice you for $20.
     
  13. snwcmpr

    snwcmpr Subscriber

    Offline
    Joined:
    Nov 16, 2011
    Messages:
    12,260
    Location:
    North Carolina
    I looked at a grey pump a few minutes ago. And it did indeed have that 'line' in the spindle hole. I cleaned it, checked the o-rings, and got a Whisperlite International running with the grey pump.

    If you did not want to buy a repair kit for the stove, maybe stop by an auto parts store and check the fuel resistant o-ring drawer.
     
  14. montanafan

    montanafan United States Subscriber

    Offline
    Joined:
    May 3, 2019
    Messages:
    51
    Location:
    Portland US
    Cleaned and oiled the o-ring. Seemed to help with the shut off. It still runs for a good bit as the fuel line holds a fair amount. Eventually, it shuts off. Will shut off sooner if i hold the unit inverted for a minute. Correct me if wrong, but I seem to have an X-GK no shaker with upgraded pot stand and striker added. I bought it without a flame spreaded, so I made one out of brass. 1983? or is the dating system still questionable. Didn't come with the gray pump (that came with an unstamped block Whisperlite.)

    Resized952019061495153342.jpg

    Resized952019061495145824.jpg

    Resized952019061495150315.jpg
     
  15. snwcmpr

    snwcmpr Subscriber

    Offline
    Joined:
    Nov 16, 2011
    Messages:
    12,260
    Location:
    North Carolina
    When you shut off the stove, there is a lot of fuel still in the line. Could it be a delay? Or did you mean it never goes out?

    After the flame goes out, I invert the whole stove assembly to release the air.