The Briggs & Stratton 391065 Engine Carburetor regulates the mixture of air and fuel supplied to the engine, supporting proper combustion and consistent operation. It delivers the fuel mixture needed for the engine to run and helps maintain reliable starting and performance when functioning correctly. Replacing a worn or damaged carburetor can help address fuel delivery problems and r... https://www.wholetoolbox.com/briggs-stratton-391065-engine-carburetor/391065.html