203957 - Miller Fuel Strainer for Kohler CS 8.5/10/12 Engines

Technical Overview of the Miller 203957 Fuel Strainer

The Miller 203957 is a specialized fuel strainer designed for use with Kohler Command Pro CS series engines, specifically the 8.5 HP, 10 HP, and 12 HP models often integrated into Miller engine-driven welding generators. This component serves as the primary filtration barrier within the fuel system, located typically at the fuel tank outlet or within the fuel line assembly. Its primary function is to intercept particulate matter, sediment, and rust that may accumulate in the fuel tank or be introduced during refueling, preventing these contaminants from reaching the carburetor.

Constructed to OEM specifications, this strainer ensures the correct flow rate required by Kohler CS engines while maintaining a filtration micron rating sufficient to protect the delicate jets and passages within the carburetor. In industrial welding environments, where dust and debris are prevalent, the integrity of the fuel system is critical for maintaining consistent engine RPM and, consequently, stable welding arc output. A compromised or clogged strainer can lead to fuel starvation, resulting in lean running conditions, engine surging, or complete shutdown.

This part is identified by Miller Electric SKU 203957 and is the direct replacement for the original equipment installed at the factory. It is engineered to withstand the vibration and thermal cycling inherent to engine-driven welding operations. Regular inspection and replacement of the fuel strainer are recommended as part of a comprehensive preventative maintenance schedule to ensure the longevity of the engine and the reliability of the welding power source.

Compatibility and Specifications

The 203957 strainer is verified for fitment on the following engine models found in select Miller equipment:

• Kohler Command Pro CS 8.5
• Kohler Command Pro CS 10
• Kohler Command Pro CS 12

Technicians should verify the engine model number on the equipment data plate before installation to ensure proper fitment.