High Quality Content by WIKIPEDIA articles! A Fast fuel system allows speedy refuelling of vehicles. Most large earthmoving and mining vehicles with diesel fuel tanks over 150 US gallons (570 L) are equipped with fast refueling systems. Fast refueling systems utilize an automatic shut off fuel nozzle, receiver and level control device. Fast refuel systems operate by connection of a fill nozzle to the vehicle`s fuel tank and a source mounted pump delivers fuel into the tank at rates up to 150 US gallons (570 L) per minute.