200A and 202 reproduction
frames back
in stock.

Scoutmaster
I just replaced a pump cup on one of our Scout troop's venerable 400bs, and when I went to pressurize the stove to test it fuel shot out of the hole in the end of the pump handle.  I have never seen that before.  I don't believe that it's a design feature. :-)

Any ideas about what may be causing it and where to start troubleshooting and repair?

Thanks,

Chuck
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Smudge
Sounds like 2 problems.
1) the tank may be overfilled. If not, it's a more serious problem.
2) Sticky leaking check valve. Remove the pump.  Insert the sharp end of a wooden skewer and push on the silver ball bearing in the check valve and it may loosen up. Then work the pump back and forth.
"If all the beasts were gone, men would die from a great loneliness of spirit, for whatever happens to the beasts,
also happens to the man. Whatever befalls the Earth, befalls the sons of the Earth.” - Chief Seattle

ICCC # 1726  -  Bernz0matiC Appreciation Club #057
Perfection Heater Collectors #6
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Tgarner01
Those stoves are fairly easy to overfill, and pumping it up on an unlevel surface could cause an issue also. Hopefully that's all that's going on 🤞
Toby Garner
ICCC #1939
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Sierra Roadrunner
+1 on what Smudge wrote.
I had that happen one time with a 508 I have.  It could be that your stove and mine somehow got turned over which allowed fuel to get into the air tube which is attached to the pump tube on the inside of the fount. 
In any case I had to work the pump through several cycles without lighting it before the fuel stopped coming out of the pump handle and it was cleared.
Hope that solves your problem.



   Joe
ICCC #1893
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Scoutmaster
Thanks, everyone, for the quick responses!

There was only a little bit of fuel in the tank, just enough to hear it sloshing around when you shook it, so I can rule out overfilling.

Joe, the stove could have been turned over, so fuel coming through the air tube is a possibility.  I pulled the pump assembly out and found a pool of fuel at the bottom of the pump tube.  That drained off without it refilling on its own, so hopefully that's all it is.  I'll reinstall the pump assembly and try pressurizing it again to see what happens (although I'll do it outside this time rather than at the kitchen table).

Smudge, if I have to go to the next step and mess with the check valve, when you say "remove the pump," that includes unscrewing the flat-sided brass rod that sticks up from the bottom of the pump tube, right?

Chuck
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Smudge
Yes, unscrewing and removing the square rod will reveal the check valve. You'll see the silver ball in the valve.
"If all the beasts were gone, men would die from a great loneliness of spirit, for whatever happens to the beasts,
also happens to the man. Whatever befalls the Earth, befalls the sons of the Earth.” - Chief Seattle

ICCC # 1726  -  Bernz0matiC Appreciation Club #057
Perfection Heater Collectors #6
Quote
Scoutmaster
Thanks, Smudge.  I have read a bit about check valves going bad but was never quite sure how to get to it.  I am sure I am going to need that information at some time with the troop's stock of 3 440Bs, 2 550Bs, my 2 425Fs, and slowly growing collection of lanterns.

After my last message, I went and reinserted the pump assembly.  I had replaced the original neoprene pump cup with a leather one, and installing that required a little bit of fiddling around the edges with a very small screwdriver to get it to fit into the pump tube.  As I was doing that, I realized I was laying the stove on its side, which is probably how I managed to get fuel into the pump tube in the first place.

After I got the pump assembly back in, it pressurized without any fuel blow-back or leaking, and it fired right up when I went to light it.  Just boiled a kettle on it and am now settling down on the back porch to listen to the cicadas and enjoy a cup of tea, Earl Grey, hot.

Thanks so much, everyone, for sharing your expertise.  I really helped me work through the problem and get the stove working again.
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Sierra Roadrunner
It's good to see you have success Scoutmaster. That's good news and welcome  to the CCF .

   Joe
ICCC #1893
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