yep. Is it an LP 2500 micro? I had one in my Bigfoot and ended up selling it. I had issues with it from day 1. I had an Onan tech come out for $300 an hour to service it and while he eventually got it running, it never stayed running and he even said he had no idea what was causing the issue. Mine would only run when holding down the starter which is really bad for it. As soon as I'd let go, it would shut off. Apparently there were tons of issues with this model. I sold mine for $800 and was happy to get rid of it. It was the only appliance in my Bigfoot that didn't work. I upgraded to solar and hope to get a portable Honda genny one day but happy to have that awful Onan gone.
If you insist on keeping it, just do a quick google search for the genny model. You'll find a ton of people posting all sorts of different issues and potential fixes. None of them worked for me and everyone seems to be in agreement that these things are garbage.