Emptying and filling of the Urea tank

This function is used to empty and fill the Urea tank.
Note:
Filling of urea should be done in the function.
Resetting of tank level, for refilling of the Urea tank, is done in the function.
Test prerequisite:
Performance:
  1. Start the function.
  2. Draining of the Urea tank.
  3. Filling of the Urea tank.
  4. Resetting of Urea level is done in the program.
  5. The function is done.