Maretron FFM100 Fuel Flow Monitor – FFM100-01

The Maretron FFM100 Fuel Flow Monitor (FFM100-01) is a precision marine instrumentation module that brings real-time fuel or fluid flow monitoring to your NMEA 2000® network. When paired with compatible positive-displacement flow sensors (sold separately), this monitor converts fluid flow data into network-ready information that can be viewed on NMEA 2000®-enabled displays, chartplotters, or vessel monitoring software — helping you optimize fuel consumption and system performance. 

Built for the marine environment, the FFM100 provides accurate, temperature-compensated data by leveraging advanced metering technology and built-in temperature sensors to account for supply vs. return fuel line temperature differences — improving accuracy over traditional systems. It also detects and compensates for brief reverse flow caused by pressure fluctuations, ensuring cleaner, more reliable consumption measurements. 

This versatile unit can be configured for differential flow rate — ideal for diesel engines with both supply and return sensors — or to monitor two independent fluid channels (e.g., fuel on one channel, water or oil on the other), depending on your installation needs. 

Performance & Compatibility

• Fluid Types: Fuel (diesel or gasoline), water, oil, and other liquids when paired with proper flow sensors

• Operating Voltage: 9–32 VDC (typical NMEA 2000® network range) Resolution: 0.1 LPH (0.026 GPH) 

• Accuracy: Differential mode ~±1.75% of reading; independent sensors ~±0.25% of reading when used with appropriate sensor factors 

• Network: NMEA 2000® certified for standard connectivity 

Note: Requires one or two matching positive-displacement flow sensors (e.g., Maretron Fuel Flow Sensor 2-100 LPH - M1AR, Maretron M2AR Fuel Flow Sensor 6.6 To 132 GPH, Maretron Fuel Flow Sensor 3‑25 LPM - M4AR, etc.) to measure flow. Sensors are sold separately.

Benefits

• Optimizes fuel usage: View consumption data in real time to adjust throttle or routing for best economy

• Improved diagnostics: Detect issues such as abnormal flow or leaks before they become major problems

• Flexible monitoring: Use in various installations — from single-engine boats to vessels with complex fluid systems

• Broad display support: Information can be shown across NMEA 2000®-compatible instruments and software

Applications

• Real-time fuel consumption monitoring on diesel and gasoline engines

• Vessel performance optimization for cruisers, yachts, and commercial craft

• Monitoring other fluid flows such as freshwater, cooling, or oil systems

• Integration with onboard displays, chartplotters, and N2KView® vessel systems

Summary for the User

The FFM100 is the gold standard for boaters who want to save money by finding their engine's "sweet spot" for fuel economy. It is a professional-grade tool that brings commercial-vessel accuracy to recreational boats. If you are monitoring a diesel engine, remember that you will need to purchase two sensors (one for supply, one for return).

Installation Tip: For maximum accuracy, ensure your supply fuel sensor is installed after the primary fuel filter to protect the meter's internal rotors from debris larger than 70 micrometers.

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.

Manufacturer : Maretron
Manufacturer Part No : FFM100-01
UPC : 873804003276