MSR standard stove pumps (Grey and Red or Grey and Black) are compatible with all MSR liquid fuel stoves, except the DragonFly stove. DragonFly-specific pumps (Red and Red or Teal and Red) will only work with DragonFly stoves.
Does your fuel pump not match these colors (yellow, grey/black, or blue/red) and have a round, metal control valve? Sounds like you have one of our older, obsolete fuel pumps. We offer a fuel pump upgrade option through our Repair Shop, please contact our Warranty and Repair department for more information.