Gas Tank also known as a petrol tank is a container where the fuel is stored inside the vehicle. This tank is located at the rear left side of the vehicle in most cases. The gas tank comes with a pump system which is used to pump the fuel from the tank to the engine using a hose pipe. The gas tank comes in various size, and the size of the tank depends on the vehicle. The gas tank is used to store the fuel, and the system is required to contain the specific quantity of fuel; to avoid leakage, and to help limit the evaporative emission. The gas tank has be to filled in a secure way, as the gas is ignitable it should not be poured on other areas that might catch fire. The main task in any situation of a gas tank is to store the fuel, till the engine needs to use the stored fuel.