bought a 2017 kw w900l

[JimT]

DEF tank has the pump on the bottom. Not sure if it's exactly the same, but underneath there should be a plate held on by 3 bolts. Take one out and loosen the other two, open plate, unscrew cap and access DEF filter. New filter comes with a plastic tool to pull old filter down. When you replace make sure new filter is all the way up. All the way! Otherwise the screw on cap won't close all the way and you'll leak DEF everywhere. Takes a few minutes to build up pressure so it might not leak immediately upon starting the engine. How do I know this? ... yeah ... been there ...