What should be used to cover the ends of fuel and oil lines that have been disconnected from the engine?

What should be used to cover the ends of fuel and oil lines that have been disconnected from the engine?

• A. The correct plugs or caps.
• B. Tape.
• C. Plastic wrap.
• D. Paper caps.

Answer: (A)

When you disconnect fuel or oil line ends from the engine, they must be sealed with proper plugs or caps designed for aviation fuel and lubrication systems. This creates a tight, fuel- and oil-safe seal that keeps dirt, moisture, and other contaminants out of the system and prevents leaks or spray if lines shift or vent. Using items like tape, plastic wrap, or paper caps isn’t reliable: they can shed material, degrade under heat, or fail to provide a true seal, risking contamination or fire. Always cap the ends with the correct plugs or caps intended for those lines, and remove them and reassemble with the proper hardware when reconnecting.

When you disconnect fuel or oil line ends from the engine, they must be sealed with proper plugs or caps designed for aviation fuel and lubrication systems. This creates a tight, fuel- and oil-safe seal that keeps dirt, moisture, and other contaminants out of the system and prevents leaks or spray if lines shift or vent. Using items like tape, plastic wrap, or paper caps isn’t reliable: they can shed material, degrade under heat, or fail to provide a true seal, risking contamination or fire. Always cap the ends with the correct plugs or caps intended for those lines, and remove them and reassemble with the proper hardware when reconnecting.