Emission-Related Components

This appendix specifies emission-related components that we refer to for describing such things as emission-related warranty or maintenance or requirements related to rebuilding engines. Note that inclusion of a component in Section III of this Appendix does not make it an emission-related component for engines/equipment that are not subject to evaporative emission standards. I. For exhaust emissions, emission-related components include any engine parts related to the following systems: 1. Air-induction system. 2. Fuel system. 3. Ignition system. 4. Exhaust gas recirculation systems. II. The following parts are also considered emission-related components for exhaust emissions: 1. Aftertreatment devices. 2. Crankcase ventilation valves. 3. Sensors. 4. Electronic control units. III. The following parts are considered emission-related components for evaporative emissions: 1. Fuel Tank. 2. Fuel Cap. 3. Fuel Line. 4. Fuel Line Fittings. 5. Clamps*. 6. Pressure Relief Valves*. 7. Control Valves*. 8. Control Solenoids*. 9. Electronic Controls*. 10. Vacuum Control Diaphragms*. 11. Control Cables*. 12. Control Linkages*. 13. Purge Valves. 14. Vapor Hoses. 15. Liquid/Vapor Separator. 16. Carbon Canister. 17. Canister Mounting Brackets. 18. Carburetor Purge Port Connector. *As related to the evaporative emission control system. IV. Any other part or system that meets the definition of critical emission-related component. [73 FR 59344, Oct. 8, 2008, as amended at 81 FR 74235, Oct. 25, 2016. Redesignated and amended at 88 FR 4718, Jan. 24, 2023]