The Diesel Exhaust Fluid (DEF) Pump pressurizes the DEF fluid allowing it to be delivered into the DEF injector to mix with the exhaust fumes enabling the SCR (Selective Catalytic Reduction) system to reduce the amount of Nitrogen Oxide before releasing it from the vehicle resulting to a lower concentration of nitrogen oxide in the diesel emissions from the engine. The DEF pump can easily be located on top of the reductant heater assembly inside the DEF tank. Do not use lubricants to prime o-rings or the pump itself, only use DEF fluid. If you are experiencing the speed limiter issues and the vehicle is operating at a reduced power, warnings appear on your instrument cluster about the DEF system then you may have a problem with your DEF pump assembly as this also includes a new sensor, orings, mounting bolts and a syringe for priming. Fits the following vehicles : 2011-2016 F-250 Super Duty 6.7L 2011-2016 F-350 Super Duty 6.7L 2011-2016 F-450 Super Duty 6.7L 2011-2016 F-550 Super Duty 6.7L 2015-2018 Transit-150 3.2L 2015-2018 Transit-250 3.2L 2015-2018 Transit-350 3.2L 2015-2018 Transit-350 HD 3.2L Replaces part numbers: BC3Z5L227K, BC3Z5L229L, 904-369, 904369, BC3Z5J229L, BC3Z-5L229-L, BC3Z-5L227-K, BC3Z-5J229-L This is a compatible replacement part manufactured by AA Ignition. This DEF pump kit is NOT a genuine OEM part. Vehicle makes and their associated vehicle models and part numbers are used in this listing only to identify the vehicles this DEF pump kit fits.