In general, when loading a tank with flammable liquids:

Question

Before loading or unloading a tank with flammable liquids, you should turn off the engine, unless running the engine is necessary to operate a pump. Ground the tank before opening the filling hole and maintain the ground until after closing the filling hole.

Accepted Answer

A ground should be established before opening the filling hole.

Answer

The engine should be running.

Answer

A ground should be broken right before opening the filling hole.

Answer

The filling hole should be locked during loading.