Has anyone drained the DEF from the tank on the Sprinter 3500 chassis ? We would like to do so and have been told there is a pinch tube on the bottom of the DEF tank (Sprinter 3500) that can be accessed to drain the fluid. Thus you can then add new fresh DEF to the tank.
As our RV sits more than moves and the DEF does have a shelf life of about 2 years (and effected by temperature) it would be safe to drain and fill with fresh DEF as preventative maintenance.
A mechanic stated that the pinch tube on the bottom of the DEF tank is located about 2/3 back (of the cab). This seems like it would be quite far back and would be in the area of the passenger side running board on our LTV Unity. The front area of the wheel well is covered and nothing is visible.
Any help as to the location and access to the bottom of the tank would be greatly appreciated.
TIA