Thanks for the reply to all of you. I only have 344 hours on gen and I had full tank of gas, oil level was fine, I was only running front AC when it happen first time. I've change oil, oil and air filter but not fuel and it ran for 4 hours and shut down. It makes no sense to me that it starts right away and run that long with a bad fuel filter. It shut down first time it was very hot outside but since then it has done it when temperature wasn't bad at all. I have noticed that the electronic fuel pump is very hot to the touch when it shuts down.