Generac 58370 cranks for half a second and does not start

Hi all, We got a home with a Generac 58370 generator installed. It worked for us a few times. A month or so ago we had an outage and it ran well but we powered it off for the evening and it wouldn't restart. It has never functioned on automatic (previous homeowner did not have it set up for that) and was always turned on manually.

I checked oil level and pulled the battery out of my van to see if changing that did anything and the symptoms remain.

It tries to start briefly and sounds like it is getting good power at that time. It cranks for about half a second and stops. A few seconds later it will try again.

Any ideas on what I should be checking next? I am pretty handy but am not finding much online about this issue.

Thank you.