Key Features

• Genuine OEM Diaphragm – Briggs & Stratton Diaphragm 391681, manufactured to original specifications for precise fit and dependable performance.
• Responsive Fuel Control – Flexes with engine vacuum/pressure changes to maintain accurate fuel metering.
• Durable Construction – Engineered to withstand repeated flexing, fuel exposure, heat and engine vibration.
• Easy Replacement – Designed for straightforward installation during routine carburettor service or rebuild.
• Consistent Performance – Supports smoother running, reliable starts and steady throttle response under varying conditions.

Product Details

• Product Type: Carburettor Fuel Pump Diaphragm
• Part Reference: 391681
• Function: Regulates fuel flow by flexing in response to engine vacuum/pressure changes within the carburettor.
• Durability: Materials designed to resist repeated flexing, fuel exposure, heat and engine vibration.
• Replacement Guidance: Use genuine OEM diaphragm to ensure optimal fuel system function and smoother engine performance; recommended during routine carburettor servicing or rebuilds.
• Fitment Tip: Compatibility depends on the engine model and carburettor design — verify with the engine model/tag or compare with your existing diaphragm before ordering.

Compatibility

• Applications: Typically used on air-cooled small Briggs & Stratton petrol engines with carburettor fuel pump systems that require this diaphragm design.
• Common Platforms: OHV engines in the 5.5 hp–6.5 hp range with specific carburettor configurations; includes selected Intek and Sprint series where 391681 is the manufacturer-recommended diaphragm.
• Walk-behind lawn mowers, garden tractors, compact tillers, pressure washers and generators powered by Briggs & Stratton engines that require this diaphragm.
• Important Note: Fitment depends on exact engine model and carburettor design; check the model/tag or compare with the existing diaphragm before ordering.