The pump is corectly asembled,i think.But i used this for help (http://www.detali.ru/cat/au/au.dll?SelPg&t=8BP8LDQT/CxyE/wsskmUFcFSpQqjSslmG4n8LMBMfBzwU/5TEDfcLvA33C7wM/xG6hL8Cmp72R5Xgvwsl5rZsNGfwDOtJFsdyS8NFDxas2PngK3s0cKsrWmo1n9TBcCo/5uuOYdxZrn1wn5OlFMqeXoXp0BhYmRw0UdTnJXdpVTKKT/dhzevqfkQqIJJsw==)

I will try to fill the tank up to nearly full and try again and see what happens.