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Hi. I just bought a Pocket Rocket 2 and a MSR 4oz gas canister. I just tested it out before going to Glacier National Park next week. When I attached and detached the canister a couple of times there was some gas leakage each time (while I was screwing the canister on and unscrewing it). I live at 4,000 feet. Is this normal?
Howdy @Tonydavid. Thanks for your question... while I'm not an MSR engineer I have used these canisters for 20 or so years. What you're describing could be normal (a little gas escaping before the valve closes) or a "leaky valve." Every once and a while (very rare) I've seen a "leaky valve" in a canister. It's usually an old canister that might have a little dirt/debris that has fallen into that small hole while in my pack or storage. Now I always try to put that cap on to prevent any contamination. I live at 5000 feet so I don't think it's an "altitude thing." You might try submerging the canister under water to see if the valve is continuously leaking. If not, you could compare to a new canister to guage if the fuel loss is noticibly more dramatic. Happy Trails!
Even at lower altitudes, I always hear a little "hiss" when connecting and disconecting the stove and cannister. I think it is normal. I agree with REI Jason0 about using the plastic cap to cover the valve during transportation and storage and about how to test for leakage.
Howdy @Tonydavid Thanks for the clarifications. It sounds like some more troubleshooting is required as what you described seems "not normal." I'd suggest trying a new canister at this point. From there, perhaps a stove issue. Super hard to diagnose with you digitally. Please don't hesitate to drop into an REI store for an in-person evaluation!