50:1 Fuel/Oil Mix Ratio Recommendation for 2-Stroke Wildland Fire Portable Pumps
Recommended change in fuel/oil mix ratio to 50:1 for Mark-3 and WICK 375 high pressure portable pumps. The 50:1 fuel/oil mix ratio has other advantages over a richer fuel/oil mixture:
  • Less carbon buildup on engine components
  • Longer service life on spark plugs
  • Ease of mixing fuel in the right ratios
  • A single fuel mix for field operations of pumps and chainsaws
  • Lower oil consumption
  • Cleaner emissions
Firefighter wearing blue hardhat, yellow shirt, green pants, and blue and black backpack. Holding white and black hoses attached to a red pump sitting on a red and white spill mat.
Equipment Bulletin 22-01
NWCG Alerts
National Wildfire Coordinating Group
Our mission is to provide national leadership to enable interoperable wildland fire operations among federal, state, local, tribal, and territorial partners.  NWCG operations standards are interagency by design; they are developed with the intent of universal adoption by the member agencies.  However, the decision to adopt and utilize them is made independently by the individual member agencies and communicated through their respective directives systems.
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