Frank, I knew there was an ongoing problem with 2013 & 2014 Onan gas RV generators. It started to give off a gas odor around 14 hours. Cummins replaced my carb & fuel pump without charge. My suggestion would be contacting Cummins Oman dealer, provide model and serial number. There is a service bulletin on replacing the fuel pumps. Otherwise you must wait for things to fail.
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2013 Forester #3051SF
2009 Toyoda Tacoma (toad)
2010 Newmar Dutchstar (Sold)
2011 Fleetwood Bounder (Sold)