I just received my new HP (20 Kohler). Question on the fuel tanks. The manual says to turn the valves at the base of the tanks to switch them over manually but there are no valves. I went back to the dealer and he was perplexed as well. We checked and none of the new HP's have the valves. Someone in the shop said that the new tanks don't have to be switched but they automatically balance out as fuel is used (some type of new valve system). Is it time to update the manual or is he blowing smoke? I currently have gasoline in one tank only and it doesn't't flow into the other tank like I would think that it would if they were connected. I use the HP for personal use and don't go through that much gas so I would like to continue with the one tank to keep the gas fresh, is that a problem? If not can I switch tanks to the one with the fuel gauge on it? Lots of questions sorry. I'm not a real gear head, I just like to mow my own lawn. Thanks for a great machine.