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 structural failures such as cracks, age-related leaks, corrosion from trapped moisture, and deformation due to blocked vents creating a vacuum.
• Fuel delivery issues, including engine power loss or shutdown, can stem from blocked fuel vents, unknown fuel line obstructions, or contamination from disintegrating internal components like fuel transmitter floats.
• These varied fuel system malfunctions highlight the importance of thorough inspections for age-related degradation, environmental damage, and component integrity.

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