If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
In this ridiculous funny Gas Station Simulator you are working as a filling station attendant. Go outside to help some customers on the full-serve pumps. As soon as a car stops by, pick the hose and try to fuel the gas tank. Don't waste gas and time to gain money. But watch out, nobody take care of each other. Much fun!