Briggs & Stratton Main Jet Fuel Assembly Module - 596521

Product Details & Features

Keep your Briggs & Stratton engine’s fuel system working at its best with this genuine OEM Fuel Module Assembly (Part 596521) — a precision‑engineered component that plays a vital role in delivering the proper flow of fuel through your carburettor. Designed to meet Briggs & Stratton’s exact specifications, this module helps ensure smooth running, consistent performance and reliable starts on compatible engines. 

Product Description:
The 596521 Fuel Module (also known as a fuel assembly or main jet module) is a key part of the carburettor’s fuel metering system. It regulates the amount of fuel delivered into the engine, helping maintain the correct fuel‑to‑air ratio for efficient combustion. This ensures your engine runs smoothly under load and at idle, reducing hesitation, stalling or rough running caused by fuel delivery issues. 

Key Features:

• Genuine OEM Quality: Built to original Briggs & Stratton standards for superior fit, reliability and long‑lasting performance. 

• Precision Fuel Delivery: Helps control fuel flow into the carburettor, supporting stable engine performance and responsiveness. 

• Direct Replacement: Designed to replace original fuel module assemblies (supersedes parts like 592804 and 595648), making it a simple swap during carburettor servicing or rebuilds. 

• Durable Construction: Made from quality materials to withstand typical operating conditions on lawnmowers and other outdoor power equipment. 

• Compatibility: Commonly used on selected Briggs & Stratton 125cc and 450E series engines produced before specified code dates — always check your engine’s model, type and code for correct match. 

Why It Matters:
A properly functioning fuel module is essential for delivering the right amount of fuel to your engine. A worn or clogged unit can lead to hard starting, poor throttle response, reduced power or unpredictable running. Replacing it with this genuine 596521 fuel module restores correct fuel metering — helping keep your engine running smoothly and reliably.