Which option best completes: The main fuel strainers collect water and sediment, and also keep foreign matter out of the carburetor.

• A. Collect water and sediment, keep foreign matter out of carburetor
• B. Filter air
• C. Lubricate moving parts
• D. Adjust fuel pressure

Answer: (A)

The main idea being tested is how fuel strainers protect the carburetor by cleaning the fuel before it enters the engine. Fuel strainers are placed in the fuel line to collect water and sediment and to keep foreign matter out of the carburetor. Water in fuel can cause corrosion and poor combustion, and sediment or debris can clog tiny passages in the carburetor, leading to poor metering and performance. Filtering air is the job of the air filter, not the fuel strainer, and lubricating moving parts is the role of the engine oil system. Adjusting fuel pressure is done by the fuel pump and regulator, not by the strainer. So the option that states it collects water and sediment and keeps foreign matter out of the carburetor is the best choice.