Def tank

[Tomlv]

How do I drain a def tank on a 2017 duramax 2500 hd?

[veeref]

The best way is to drop the tank and drain it from the fill tube. If it’s anything similar to the LML, you’ll need to remove the shield, unbolt the straps and drop the tank. From there you disconnect all the electrical connectors and hoses. Stuff something like a stick to hold the flapper valve open and you should be able to drain it from the fill hole.

[Tom Vollmer]

Thnx very much sir!