Rookie fuel hauler advice?

It's that little lever that you lift to drain the contents of the fill bucket into the tank.

 

I don’t believe I was ever told about this lever. And I don’t think it will be a good idea to do because many of the buckets I see actually fill up with water from the melting snow.

At work we have three main customers with different agreements.

Ch: they contract a third party to empty the buckets. Some stations keep them very clean, others have leaves in them turned to muck from previous years.

Holi. us drivers are to empty them out whenever wet and dump in special barrels the stations are supposed to have.

Safe. the cashiers /attendants maintains them themselves.