Where should a fuel strainer be fitted in an engine?

The fuel strainer is ideally fitted before the main jet in an engine to ensure that only clean fuel enters the fuel delivery system. By positioning the strainer at this point, it effectively filters out any impurities or debris that might be present in the fuel before it reaches critical components, such as the carburetor or fuel injectors. This placement helps to protect the engine's fuel system and maintain optimal performance by preventing clogging and ensuring a consistent flow of fuel.

While fitting a strainer in the inlet manifold or at the air intake could have implications for air quality and fuel mixing, they do not serve the purpose of filtering fuel effectively. Additionally, positioning the strainer after the main jet would be less effective, as any contaminants would have already passed through the main jet, potentially leading to performance issues or damage to the engine. Thus, fitting the strainer before the main jet is crucial for maintaining the integrity and efficiency of the fuel system.