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FW Murphy AFR-64L Lean-Burn Air-Fuel Control System

The AFR-64L air/fuel ratio controller provides stateof-the-art engine control in one simple, easy-to-use product.

Automatic Operation: No operator intervention needed – the AFR-64L controller automatically tracks multiple factors, including engine load, tailpipe emissions and more, then precisely adjusts the air/fuel mix to maximize fuel efficiency, minimize engine emissions, improve engine performance and reduce maintenance costs.

Emissions Compliance: The AFR-64L controller optimizes the lean-burn air/fuel mix to maintain targeted emissions levels over varying engine loads, speeds, fuel quality and ambient conditions.

Cost Savings: Pinpoint performance problems and avoid detonation. The AFR-64L controller’s advanced troubleshooting and diagnostics cover 76 critical operating parameters, allowing the operator to cut the costs of maintenance, labor, downtime and replacement parts.

Take control over your engine needs – engine diagnostics, emissions control, fully automatic operation – the AFR-64L does it all for you. 

FW Murphy AFR-64L Lean-Burn Air-Fuel Control System


Open loop/feed forward control combined with closed loop exhaust gas oxygen sensor feedback and a super fast-acting fuel control valve

Allows for rapid response to engine load changes

Vital for generator sets and other applications with severe engine load variations

Helps maintain compliance even in the event of an oxygen sensor failure


  • Fast, easy, low-cost installation
  • Fits virtually any lean-burn, spark-ignited, carbureted natural-gas industrial engine
  • Windows-based platform compatible with most computers
  • Software, upgrades and documentation available on disk or online
  • High-speed full-authority butterfly fuel control valves for quick response time
  • Comprehensive 76 fault diagnostics