Running problem

[tbiddle]

I have a 2001 Cub cadet 2146 ...been a great mower till this point. Having problem with it running. Will start and run but after a few minutes of being under a load of mowing it will start cutting out. I have clean carburator bowl, blew out all lines, change fuel filter ,air filter ,oil, new plug, fresh gas, but still runs and then it starts cutting out , I have to run with choke completely out, loses power tis way ...any other suggestion.

 

[OldMachinist]

Two things I can think that would cause it.
Plugged fuel cap vent
Fuel pump bad or going bad

Try running it with the fuel cap loose and if it runs better then either replace the cap or try to unclog it.

The fuel pump is vacuum operated make sure the vacuum line doesn't have any cracks and is clear of any fluid or debris.