What are fuel strainers?

• A. Used to check for and prevent moisture, dirt and other contaminants getting to the engine
• B. They measure fuel flow
• C. They regulate pressure
• D. They filter air into the engine

Answer: (A)

Fuel strainers are the first line of defense in the aircraft’s fuel system, designed to trap dirt, debris, and moisture before fuel reaches the engine components. By filtering out particulate matter and any water that may be present, they protect the fuel pump, injectors, and valves from clogging, wear, and fuel-system problems, helping maintain reliable engine operation. They may have a drain to remove accumulated water and contaminants.

The other roles described don’t fit this item: measuring fuel flow is the job of a flow meter, regulating pressure is handled by a regulator, and filtering air into the engine comes from an air filter in the intake, not a fuel strainer.