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 systems are susceptible to issues such as blocked vents causing structural damage (oil canning) and fuel tank leaks stemming from age, material degradation, or corrosion.
• Internal fuel system components, like fuel transmitter floats, can disintegrate, leading to fuel contamination or flow blockages.
• These varied failures can result in operational problems ranging from persistent odors and unusual noises to critical in-flight engine power loss.

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