My Onan Generator is Vexing me!

So on further troubleshooting.... I have determined two things... First and foremost it’s not fuel starvation, it’s actually flooding itself and dying. This is the case regardless as to what I clean or do to the carb. Everything is intact with the float and the needle/seat is perfectly clean. It’s obviously been running rich for a long time because the old spark plug was nasty and covered with carbon, and the brand new one that I put in ended up the exact same way. It happened to the new one after the thing only running for like 30 seconds a crack and then dying out. Second and most importantly, I realized today that I had forgotten that when I pitched the trailer, I got an extended warranty with it that covers nearly everything.... including the generator! Thus I’m going to take it into the professionals to get it fixed as it will only cost me $100 bucks for the copay. It’s obviously something to do with either the float or the pressure sensor that attaches to the bowl, not telling the pump to stop sending fuel to the carb, but it’s over my head as to what could be causing it as I’ve checked everything I can think of.