First day with my (almost) new 3025E. I was wondering what the current wisdom is regarding shutting the fuel valve after use? It would seem to me that unlike a carbureted gas engine there is no float needle valve to fail so the fuel valve won't stop fuel if the injectors are closed. Or, is leak by a potential issue? Tractor runs great!! I leave the box blade attached for ballast. I know I should have more. It's gonna happen.