Here are some FAQs from MSR's website in this list that deal with various problems with MSR stoves. I assume the Firefly is an old model, but some of their tips might apply. If you don't see an answer there, I would call MSR and ask them. They have very good customer service.
MSR customer support


Edited by TomD (03/23/08 02:57 PM)
_________________________
Don't get me started, you know how I get.