I personally don't know what is required. I have enough industrial knowledge to adapt to any situation I may come across but am blind beyond general guesswork and dubiously researched fiction. Can I power the pump itself with my vehicle 12VDC-120VAC inverter? Do I need an explosion proof 12VDC pump? What's the suction head or access dimensions? What works? Who has definitive knowledge on what is required to get gas out of an underground tank?