All works done on or around the fuel tank or the filler neck should be done by a professional due to the risks that come with the work. Although, there may still be explosive fumes in the fuel system after the cleaning and flushing and these may explode particularly during repair of tanks. In case of removal of the fuel tank from the vehicle, one should not store it in a place that may cause explosion as a result of spark or flames in presence of the fuel fumes. Special care has to be taken where there are natural gas type appliances; the pilot light may cause an explosion.