8413.91.10.00 - Of fuel-injection pumps for compression-ignition engines

This HTS category, 8413.91.10.00, specifically covers parts designed for fuel-injection pumps intended for compression-ignition (diesel) engines. These components are integral to the precise delivery of fuel into the combustion chamber of these engine types, playing a critical role in their operation, efficiency, and emissions control. Examples of items that would fall under this classification include nozzles, plungers, delivery valves, and other specialized internal components exclusively designed for these specific pumps.

Distinguishing this category from its siblings, 8413.91.20.00 covers parts for stock pumps used in the pulp and paper industry, which are generally designed for moving larger volumes of fibrous suspensions rather than precise fuel delivery. The other sibling, 8413.91.90, acts as a residual category for parts of pumps that do not fit the specific criteria of fuel-injection pumps for compression-ignition engines or stock pumps for the paper industry.

As this is a leaf node within the HTS structure, there are no further subcategories for this specific classification. Therefore, the classification relies on the precise definition and intended use of the part being imported, ensuring that it is exclusively a component of a fuel-injection pump for compression-ignition engines. Proper documentation and understanding of the pump's application are crucial for accurate classification.