Clogged stoves. When gunk clogs jets and burners so thoroughly that you can't clean them at home, send it to a stove expert for complete disassembly and cleaning.
Lost or dried out O-rings, gaskets, or hoses. See Gear Works, December 1998 for filter maintenance tips. Or call the manufacturer, your local outdoor retailer, or a repair shop for replacement components.
Broken pump housing. That component must be replaced. Broken stove generators/preheat tubes.
The stove is unsafe to use. Discard it.
Click here, for a guide to repair shops nationwide.