Mower just stopped running

I own a Gravely PM 320 HD 60" mower and have a problem.
It stopped running yesterday and then started for a minute. I was able to start it and limp it into my garage
using quick start. It seemed to be starving for gas. I had put a electric fuel pump on a year ago and it has worked great and was pumping gas..
I pulled the carb off and found it was dirty and there was two o-rings broken. I cleaned it and replaced the o-rings.
It started and was running great. I took it out this morning and it started great and ran great. I started to cut the grass
and it suddenly stopped running. When I tried to start it, it would not even turn over. My red light comes on and the electric
fuel pump is working but it will not turn over. It is still setting on the lawn.

Is there any oil in the engine ?
Some have an idiot switch that shuts down the engine should the oil level drop below the minimum.