Generator ran fine all day. refueled then no power

I am assuming after re-fueling your output power stopped working. If this is the case then remove the small cover from the end bell and inspect the brushes. They must touch the slip ring. The best way to check to see of the brushes are touching the slip ring is to use a multi-meter on a Resistance scale of R x 100 or R x 1000 and you should see a very low resistance reading. If you have a high resistance reading or an open indication on the meter; the brushes are NOT touching the slip ring. They are either too short from use or damaged due to breakage or heat caused by loose connections.
Inspect the brushes one at a time. There should be at least 3/8 inch of visible carbon brush. Anything less and it is time to change the brushes.

If you need more assistance or I completly missed the mark respond here and I wil help you.
Thanks for choosing FixYa,
Kelly