2000' Onan 4000 Microquite generator replacement

I had a Honda engine carberated that unless the gas was turned off the carb would allow gas to flow into the engine while going down bumpy roads. New engine with <10 hours, missed so bad it would hardly run while smoking horribly. I drained the crankcase and put new oil in, replaced the spark plug and the problem was solved.

Could this be a problem on an Onan too? Have you checked the oil level to see if it has risen?