2008 cub cadet rzt 50 run for 20 min than dies while mowing put new pump on, new fuel filter, new air cleaner, new plugs. has a 22hp kawasaki engine. fuel lines clear

The OHV engine requires periodic valve adjustment. Typically every 300 hrs.

Another possible cause is an ignition module failing at operating temperature. Run until it fails and check for spark at BOTH plugs.

First of all, you want to make sure the fuel filter is installed correctly. Then the filter may be restricting the flow. To solve the problem, you half choke the carb. That should take care of it.

probably find missing dampener spring of the governor lever to the carby throttle lever

Check again piece by piece all that you just replaced to make sure one of then is not faulty from that house.
Check the oxygen sensors
The engine PCM
Catalytic convertor

Wish you luck

there is code that does not turn on the service engine soon. have code retrieve.And when the problems occured have fuel pressure check.You have to find out if the problem is electrical or fuel and air .Another way to find it is move engine harness while engine running if it stall could be short to ground or wire cut open

Tune up,plugs wires,coils.crankshaft sensor.

yes try getting the fuel pump pressure tested by a mechanic. the other thing it can be is the injectors are plugged try running some lucas fuel system cleaner.

bad fuel pump or plugged fuel filter also make sure your air cleaner is not plugged up

Take mass air flow sensor off and clean it with a non-chlronated brake cleaner let it dry for 30 minutes then reinstall..

if you release throttle slowly does spead pick up poss plugg exhaust conv, plugged air cleaner, plugged fuel filter, most likely exhaust