Liquid fuel stoves, like the MSR Whisperlite, are the workhorses of the stove world. They operate in any conditions, any temperatures, any altitudes—but they can be finicky. One of the most common problems with these stoves is an erratic yellow flame instead of a consistent blue flame. In this tutorial on how to repair a liquid fuel camp stove, Kristin Hostetter will show you the steps she goes through to solve the mystery of an unstable flame and restore a stove to peak performance.