Key Features Genuine Briggs & Stratton OEM Main Jet Fuel Assembly Module (Part 596521) designed for Briggs & Stratton carburettors, ensuring accurate fit and long-term reliability. Precision fuel delivery: controls fuel flow into the carburettor to sustain a consistent fuel-to-air ratio, supporting smooth idle and responsive throttle. Direct replacement that supersedes original fuel module assemblies 592804 and 595648, simplifying carburettor servicing or rebuilds. Durable construction to withstand typical lawnmower and outdoor power equipment operation. Critical metering function that maintains correct fuel-to-air ratio during idle and under load, reducing hesitation and stalling from fuel-delivery issues. Product Details Part: 596521 Main Jet Fuel Assembly Module (fuel module / main jet module) Function: Part of the carburettor's fuel metering system; regulates the fuel delivered to the engine for efficient combustion and smooth operation. Quality: Genuine Briggs & Stratton OEM component designed to meet exact specifications. Replacement note: Designed to replace original fuel module assemblies; common upgrade path during carburettor servicing or rebuilds; supersedes 592804 and 595648. Construction and durability: Built to withstand typical operating conditions on lawnmowers and outdoor power equipment. Installation guidance: Verify engine model, type, and code to ensure correct match; improper fit can affect metering performance. Compatibility Commonly used on selected Briggs & Stratton 125cc and 450E series engines produced before the specified code dates. To confirm fit, check your engine's model, type, and code for an exact match with part 596521.
