Controller displays F07 – Low fuel level alarm, generator inhibited from automatic start

Safety first: No open flames or sparks near the fuel system. Follow site fuel handling procedures.

• Verify actual fuel level: Use the mechanical gauge on the base tank or day tank to confirm fuel level. If low, arrange for refueling to above the minimum automatic start threshold.
• Inspect level sensor: Locate the fuel level sender (float or pressure type) on the MTU fuel tank. Check for damage, corrosion, or loose mounting.
• Check wiring: Trace the level sensor wiring back to the MTU controller or remote I/O module. Tighten terminals and repair any damaged cable.
• Calibrate in controller: In the controller configuration menu, verify that the fuel level input type (resistive/4–20 mA) and scaling are correct for the installed sensor. Adjust calibration if readings are inaccurate.
• Replace faulty sender: If the mechanical gauge shows adequate fuel but the controller still indicates low level, replace the fuel level sensor with an MTU-compatible unit.