Purchased 2 yamaha 2000's and a berg extended tank from wise sales . The Berg tank would shut the generators off after a few minutes ,seems they dont vent properly. I called wise and they had me call manufacturer who told me its not their problem because they are not made to run the yamaha 2000's because they dont have a fuel pump and wise should not be advertising them to do so. I called wise back and told them what they said and the person at wise seemed surprised by that. I am now in limbo waiting to see what they will do about it.