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

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

if you have replaced cap and rotor plus coil and it seemed to fire up then i would take the next step. For sure put your new plugs and wires on then make sure you have replaced your air filter, and change out your fuel filter, fire up the vehicle if it doesn't start I would suggest changing the fuel pump. If it starts up make sure you put in some BK fuel injector cleaner in your fuel it might be you have dirty injectors. If all fails then get back with me and we will look else where. Good luck hope this info helps you out

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..

sounds like the new fuel pump sucked dirty gas out of the tank try changing the fuel filter and put some fuel injector cleaner in the tank, also check the fuel line it may be bent from changing the fuel pump

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