Where are fuel drains located in an aircraft engine?

Where are fuel drains located in an aircraft engine?

• A. On turbine engines, the combustion chambers have a drain valve; on many reciprocating engines, drains are in the intake manifold.
• B. In the fuel tank only.
• C. In the oil sump.
• D. In the exhaust manifold.

Answer: (A)

Fuel drains are placed where residual or spilled fuel can be safely removed from the engine system after shutdown. In turbine engines, each combustion chamber typically has a drain valve so any unburned fuel in the chamber can be purged when the engine is shut down, helping prevent fuel from pooling and reducing hot-start risk. For many reciprocating engines, the drains are located in the intake manifold, so any leaked or excess fuel from the fuel control or lines can drain into the intake and be burned in the cylinders rather than leaking externally or collecting in a hot area. Drains in the fuel tank or oil sump wouldn’t effectively purge engine fuel, and draining into the exhaust manifold would create hazards, so those locations aren’t used for engine fuel drains.

Fuel drains are placed where residual or spilled fuel can be safely removed from the engine system after shutdown. In turbine engines, each combustion chamber typically has a drain valve so any unburned fuel in the chamber can be purged when the engine is shut down, helping prevent fuel from pooling and reducing hot-start risk. For many reciprocating engines, the drains are located in the intake manifold, so any leaked or excess fuel from the fuel control or lines can drain into the intake and be burned in the cylinders rather than leaking externally or collecting in a hot area. Drains in the fuel tank or oil sump wouldn’t effectively purge engine fuel, and draining into the exhaust manifold would create hazards, so those locations aren’t used for engine fuel drains.