591378 Briggs & Stratton Carburetor — Genuine OEM Engine Replacement Part The Briggs & Stratton 591378 Carburetor is a genuine OEM replacement carburetor designed to deliver reliable fuel and air mixing for small Briggs & Stratton engines, particularly 20 cu. in. horizontal OHV single-cylinder engines. It ensures smooth combustion, consistent power delivery, and improved engine performance for lawn mowers and other outdoor power equipment. Product Details Item Number: 591378 Brand: Briggs & Stratton Part Type: Carburetor Engine Type: Small single-cylinder engines Application: Lawn mowers and other outdoor power equipment powered by compatible Briggs & Stratton engines Condition: New Genuine OEM Replacement Part Function: Mixes air and fuel for proper combustion in the engine Function This carburetor is engineered to: Accurately blend air and fuel for optimal engine combustion Restore smooth engine performance and starting reliability Improve idle and throttle response Replace worn, clogged, or failed carburetor units in compatible engines Maintain proper fuel delivery for peak engine output Verify Fitment Before Ordering Before ordering, confirm the following: Engine model and series on your equipment Compatibility with Briggs & Stratton small engines that originally used carburetor part 591378 or its superseded equivalents Proper mounting and linkage style matching your engine’s setup ⚠️ Carburetor compatibility must be verified against your engine model number — part fitment varies by engine series. Compatibility This carburetor fits a range of Briggs & Stratton small engines, especially horizontal 20 cu. in. OHV series and others that originally used part 591378. It also replaces many older carburetor numbers including: 796321 696132 696133 796322 699958 697351 699966 698455 695918 694952 695919 695330 796323 695920 695328 ⚠️ Exact engine model compatibility must be confirmed using your machine’s engine tag or parts lookup tool. Installation / Usage Drain or cap the fuel system to avoid spills during installation Disconnect the spark plug to prevent accidental starts Remove the air filter and housing to access the carburetor Disconnect throttle and choke linkages carefully Unbolt the old carburetor and remove it from the engine Install the new 591378 carburetor, aligning all gaskets and mounting bolts Reconnect linkages and air filter assembly Test engine operation and adjust as needed Maintenance Tips Use clean, fresh gasoline to prevent carburetor clogging Add a fuel stabilizer if the machine is stored for long periods Inspect and clean fuel screens and filters regularly Keep choke and throttle linkages free of debris Tune idle and mixture screws per manufacturer recommendations Equivalent / Replaces Part Numbers Replaces these older Briggs & Stratton carburetor part numbers and equivalents: 796321, 696132, 696133, 796322, 699958, 697351, 699966, 698455, 695918, 694952, 695919, 695330, 796323, 695920, 695328
