petrol tank(n = noun.artifact) gas tank, gasoline tank - a tank for holding gasoline to supply a vehicle;
is a kind of storage tank, tank
is a part of fuel system

army tank, fermentation tank, fish tank, gas tank, gasoline tank, hot-water tank, pachuca tank, petrol, petrol bomb, petrol station, septic tank, storage tank, tank, tank car, tank circuit, tank destroyer, tank driver, tank engine, tank farm, tank farming, tank furnace, tank iron, tank locomotive, tank shell, tank ship, tank suit, tank top, tank vessel, tank warfare, think tank, water tank