Jsalanoa

This problem has been discussed at length in either the Grasshopper forum or Kubota forum. It's a fuel starvation problem. Go over there and read about it or re-post your problem there.
If you had a fuel pressure gauge, it would NOT look good.

I have a 721D Grasshopper mower that is having issues. After it is running for awhile the mower will quickly lose power and rev back up to full power. Sometimes it lose power all the way down until it shuts off. Does anyone have any ideas of what it could be? Guages all look good when it quits on me.