Petrol engine water pumps are ideal where there is electric supply or where it is unreliable. Typically they have a larger capacity than electric pumps and can pump to higher head height with 25 to 30 meters being the norm for a 2" water pump. Petrol engine pumps are especially useful as an emergency water pump during or after flooding due to the danger of electric shock or outages. Remember due to the toxic exhaust fumes of an petrol engine the pump should only be placed outside.