Loses power

[Gary E]

Have a BX1880 bought new. Approx 390 hrs. Tractor will run as normal then start losing power, drops RPM and almost stalls. Will vary from 10 mins to 45 mins after mowing.
I have change fuel pump, fuel filters, ALL new fuel lines. Cleaned out the fuel tank.
Tractor never gave any issues until recently when it started this issue. Cannot use/mow as is.
Any advice Is appreciated.

 

[Runs With Scissors]

Welcome sir.

Have you checked the "fuel vent" yet?

Just to make sure its not "creating a vacuum" in the tank.