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 a variety of structural integrity issues, including cracks, leaks, and corrosion, often exacerbated by age or environmental factors like trapped water.
• Malfunctions in fuel system components, such as blocked vents or disintegrating fuel transmitter floats, can lead to tank deformation (oil canning) or fuel contamination.
• Fuel flow disruptions or blockages, whether from vents or unknown causes, pose significant flight hazards, potentially leading to critical engine power loss or complete engine failure.

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