Zero Turn Mower. I'm stumped.

Ethanol fuel is disaster for engines. I wish we could charge back to the climate activists all the time and parts we replace for the damage that fuel has caused.
I agree, BUT if you use it in a everyday or near everyday vehicle, it's not near as bad and actually has some good (detonation resistance) qualities. The problem is when it sits up for any appreciable length of time. ......and this one did just that.