Fuel Tank Frustrations

Right fuel tank cracked at top seam. Tank was replaced. Operator noticed a very loud oil canning sound from right wing after shutdown following a one-hour flight. Investigation revealed a partial blockage of the fuel tank vent, causing oil canning of fuel tank due to vacuum in fuel tank. Vent line was cleared and vented cap was replaced with new.

Key Takeaways:

• Aircraft fuel tanks are susceptible to various structural issues, including leaks, corrosion, and deformation caused by blocked vents.
• Internal component failures (e.g., disintegrating fuel transmitter floats) and external environmental factors (e.g., water retention) can lead to fuel contamination or compromise tank integrity.
• Undiagnosed or intermittent fuel system blockages pose significant flight safety risks, potentially resulting in complete engine power loss during flight.

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