What should be done with old gaskets and seals when replacing components in the fuel system?

When replacing components in the fuel system, all old gaskets and seals should be replaced with new ones to ensure the integrity of the fuel system. This practice helps prevent leaks and ensures a proper seal, which is critical in maintaining safety and performance. Old gaskets and seals can degrade over time due to factors such as fuel exposure, heat, and age, potentially leading to failures or leaks when reused.

Replacing all gaskets and seals during a component replacement is a standard maintenance practice in aviation to avoid the risk of fuel system contamination and leaks, which could have serious consequences for the aircraft's operation and safety. This approach also aligns with best practices recommended by aircraft manufacturers and maintenance organizations, fostering reliability and performance in the aircraft's fuel system.