Z122e is shutting off after 10 to 20 minutes. Have changed fuel filter emptied gas cleaned gas tank changed oil check blades for rotation everything listed in my manual.

SOURCE: Full Tank

I had the same error and the tank was not even full. I took the cover off of the unit which consisted of removing 10 screws. The water tank is on the bottom left side. I then removed the float which was a small sensor with a styrofoam float. I removed the float (2 more screws) and moved it up and down. It did not appear to move very smooth but after moving it back and forth a few time it seemed better. I put the float back in ensuring it was at the low point, screwed it back in and then tested the unit. It came on and appears to work fine now. I unplugged again putt the cover back on it has now ran 30 minutes no problems.

SOURCE: hesitation, stalling like out of gas

Clogged Catalytic Converter. What happens is as you push down harder on the accelerator you force more gas into the system causing a slightly richer mixture and more exhaust flow is neccessary. The easiest way to look for a clogged cat is when it's dark out take it for a ride causing it perform it's problem look under the vehicle if the cat is literally glowing red hot you either have a clogged cat or an extremely rich fuel mixture.

SOURCE: engine cutting off

Depends on how it cuts off. If it gradually slows down over a few minutes or surges, it's likely the carburetor needs to be cleaned and rebuilt. But if it's an immediate cut off, it's likely to be a safety switch such as the one that shuts down the engine when you get off the seat if the mower is running. Sometimes this happens frequently to a light person who bounces on the seat when mowing.

SOURCE: Onan Generator stopped working in motorhome

Yes it wil not let you run your motorhome out of fuel they set it up that way so you dont strand yourself you may have a air bubble in the fuel line to the generator try blowing air generator fule line back into the tank

SOURCE: my cub cadet tank stops running 5-20 minuts after

Yes you may need a carb kit. It is not good practice to by-pass the fuel filter. The orifice in the jet is very small.
But anyways, There Could still be a blockage inside the carb, a small leak at the manifold, or the jet is worn out.
Let me know how it goes.