8413.30 - Fuel, lubricating or cooling medium pumps for internal combustion piston engines:

This HTS category, 8413.30, specifically encompasses pumps designed for internal combustion piston engines that circulate fuel, lubricating oil, or cooling mediums. These pumps are essential components for the proper functioning and longevity of such engines. Examples include oil pumps that maintain lubrication pressure, water pumps that regulate engine temperature by circulating coolant, and fuel pumps that deliver fuel to the engine's injection system or carburetor. The classification hinges on the pump's intended application within an internal combustion piston engine.

Distinguishing this category from its siblings, other pumps for liquids (8413) are classified elsewhere. For instance, sibling categories like 8413.20 cover hand pumps, while others such as 8413.40 are dedicated to concrete pumps. Subheadings like 8413.50 and 8413.60 differentiate based on the pumping mechanism (reciprocating vs. rotary positive displacement). Category 8413.30 is uniquely focused on the specialized function of circulating fluids critical to engine operation.

This heading is further subdivided to provide greater specificity. Subheading 8413.30.10.00 applies to fuel-injection pumps specifically designed for compression-ignition engines, such as diesel engines. The residual category, 8413.30.90, covers all other pumps for internal combustion piston engines that do not fall under the fuel-injection pump subheading, including lubricating oil pumps and cooling medium pumps. This distinction allows for precise tariff application based on the specific type and function of the engine pump.