I purchesed a Ferris 3000 ZTR mower about a month ago I had mowed 5 acres for the 3rd time, I got it stuck in a ditch, I sut it off and walked around it and saw the rear bumper was hi centered and it couldn't move, I thought no big deal, I'll just go get the tractor and pull it out! When I returned about 3min later it was on fire big time, it was a total loss, Ferris replaced it under warranty, when I got the new mower I figured out what had happined, the fuel tanks are not vented properly! The filler is at the rear of the tanks with vents in the cap, there is a fill tube extending down into the tank( a decal warning not to fill above bottom of fill tube is near the filler) with the design of the tank, the large portion of the tank towards the front, if the mower is stopped on an incline with the front end up at less then 30 degree angle and the tanks even near full, fuel rushes the the rear of the tank, rising above the bottom of the fill tube rendering the vent in the cap inop. and on a warm day with sun shining on those black tanks heating the vapor area above the fuel, it takes only a minute or two for fuel to start pouring out the vent, evidently fuel got on the hot muffler and ignited I told Ferris what I had found, they called back, they had tried it, only took 1 min and fuel was starting to run out, they are working on a solution.