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Fluctuating Fuel Pressure

1. A broken O-ring on the inlet side fuel fitting can cause an inlet suction leak. An inlet air leak will result in low fuel pump output pressure.

2. Worn fuel pressure gauge

3. Clogged fuel vent or fuel cap creating suction in fuel tank.

4. Fuel line blockage.

5. Incorrect fuel pump

6. Defective fuel pump

7. Foreign material in the pump such as fuel tank sealant.

8. Sucking air. Check calculator and fuel selector

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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.