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Low fuel flow in Lycoming or Continental Aircraft Engine

1. Dirty fuel filter screen. If Lycoming fuel injection, strainer in RSA unit plugged. In Continental aircraft engines don't forget there is a fuel screen in the fuel divider.
2. Injector lean. Run engine at a given power setting at full rich. Observe fuel flow and compare to fuel flow requirements for that power setting as found in Operator's Manual. An increase in cylinder head temperature, EGT or oil temperature may be an indication of a lean injector.

fuel injection nozzle
3. Faulty gauge.
4. Flow divider does not open all the way. Problem may not occur at all times.
5. Fuel line to fuel flow gauge broken, loose, or plugged.
6. Low fuel pressure.
7. Lycoming engines with mechanical (wobble / diaphragm) style fuel pump - refer to Lycoming Service Bulletin 548 or latest edition for listing of possibly defective fuel pumps.

8. Fuel Exhaustion

fuel exhaustion

Curtis R2 1916 Pre-WWI Military Markings Curtis R2 1916 Military Marking

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Disclaimer: sacskyranch.com contains abundant information relating to aircraft maintenance. The information provided is not intended to supercede or supplement the F.A.A. approved maintenance and/or operator’s manuals. Those F.A.A. approved manuals must be utilized when performing maintenance and/or operating aircraft.