I have a 1990 Mallard Class with with an Onan Emerald Plus, 4k, 4BGEFA generator. I use the generator regularly and it gets serviced regularly. I probably used it 10 hours a month ago and 30 minutes two weeks ago. I went out yesterday to exercise it. It started, ran about 5 seconds and cut off. Now it wont start. It "seems" to be trying to start but just wont catch. It's getting fuel. I tried to check for spark but the sun was really bright and I couldn't see a thing. For the five seconds that it ran it was running smooth as usual. I replaced the control board about two, maybe three years ago. The oil was changed in May. It's always been a little funky to start. Hit the start button, it never starts. Wait 30 seconds, hit the start and it fires right up. Could it be flooding? That's my first theory. I'll go back and fool with it some more today, in the 97 degrees and 80% humidity..