Besides being located at each tank, fuel strainers may also be located at which components?

• A. Carburetor or fuel control unit
• B. Engine oil sump
• C. Cabin air intake
• D. Tank vent

Answer: (A)

Fuel strainers are placed not only at the tanks but also at the points where fuel is metered, because the fuel that reaches the engine must be clean before it is measured and delivered. The carburetor or the fuel control unit are the critical metering points, and any debris that makes it past the tank strainer could clog jets, upset the fuel-air mixture, or cause improper fueling. A strainer at the carburetor or fuel control unit provides a final line of defense, helping maintain consistent fuel flow and reliable engine operation under all conditions.

The other options don’t fit because they relate to systems that aren’t part of the fuel path: the engine oil sump handles lubrication, not fuel; the cabin air intake deals with air for the cabin, not fuel filtration; and the tank vent serves to vent fuel vapors rather than filter the fuel itself.