The MTD BS-846639 Lawn Tractor Solenoid Fuel helps control fuel flow within the fuel system of compatible lawn tractor engines, supporting proper engine starting and operation. Designed as a replacement fuel solenoid, it works with the engine’s fuel system to regulate fuel passage as required during operation. Replacing a worn or faulty solenoid can help address fuel-delivery issues, ... https://www.wholetoolbox.com/mtd-bs-846639-lawn-tractor-solenoid-fuel/BS-846639.html