Auto-tank filler is a job that involves filling up the tanks of vehicles with fuel. It requires the use of a GAS pump, which is a three-letter word for the term AUTO-TANK FILLER in a crossword puzzle. The job entails connecting the hose from the GAS pump to the vehicle's tank and then operating the pump to fill the tank with fuel. The auto-tank filler must also ensure that the correct amount of fuel is being dispensed and that the customer is charged the correct amount.