What do fuel strainers primarily filter out?

Fuel strainers are designed to filter out coarse particles and impurities from fuel before it enters the engine or fuel system. This is crucial because contaminants such as dirt, rust, and larger debris can cause damage to fuel injectors, carburetors, and other components within the fuel system. By removing these larger particulates, fuel strainers help ensure that the fuel delivered to the engine is clean, promoting optimal performance and preventing mechanical issues.

The filtration process typically involves a mesh or screen that captures these larger impurities while allowing the fuel to flow through. This is essential for maintaining the efficiency of the fuel system as well as the longevity of engine components. Although other options mention filtering other substances, they do not match the primary purpose of fuel strainers, which is to address the more substantial contaminants found in fuel.