So far not too impressed with the Onan/Cummins repair shop. They've got the generator out of the rig, and I stopped by last night since I couldn't get any decent info over the phone. They confirm the lack of fuel is the problem (duh), but don't seem to be making progress. I helped the tech, and we blew out a restriction in the vent from the demand regulator. Apparently this is common, and is called the dreaded mud dauber problem on other forums.
After pulling the demand regulator apart and not seeing any issues, we put the regulator back on. The tech turned the gas back on (he's got it set up with remote power and a bottle of propane), and didn't feel any gas coming out of the outlet of the regulator. Thinking this was wrong, he ordered a new regulator (~$200). After I got home, I got to thinking, the gas shouldn't come out unless there was some vacuum? After all, it's called a "demand regulator", right? He never tried to start it while I was there.
2007 Coachman Freelander 26' w/ E-450 6.0 diesel
1982 El Dorado Bermuda 27' w/ E-350 460 gas (sold)