A-B1808023-AI VALVE-FLOAT NEEDLEOne New Aftermarket Replacement Carburetor Float Needle Valve Fits Briggs and Stratton Small Engines This carburetor float needle valve (also called a float valve or needle and seat valve) controls fuel flow into the carburetor float bowl, preventing overflow and flooding in Fits Briggs and Stratton (B&S) small engines. A worn or leaking float needle valve is a common cause of carburetor flooding, fuel overflow, and hard starting on lawn mowers,