Zero Turn Mower. I'm stumped.

Well, after all this time, it was the gas. I disconnected all the hose, blew and flushed the tank and hose and filter out, emptied the carburetor bowl. Put it all back together and put most of a remainder of a gallon of True Fuel I had in the tank and dumped a little in the carburetor and da beeotch popped off and ran as good as it ever has. I even cut some with it. LOL This is good, because now I can use it for the more heavy cutting and save my Troy Bilt for all of the grass around the house. Thanks for the ideas fellers.

Duh, should've looked at that first!! I feel dumb now lol

I had a brand new Husqvarna push mower (I still have it, and it's great), and after the first winter....no fuel.

Flushing the fuel line into a rag revealed a chunk of what looked like white petroleum jelly with little actual bubbles that were all full of water. Removing that and switching to pure fuel with no ethanol has kept it solid ever since.