Onan Propane Generator

I had a similar problem with mine. Sometimes fire right up and others it wouldn't start at all. The exhaust had a strong propane smell also. Turned out to be a fuel problem, gummed up and I also believe a leaky line at the generator. Had it fixed at the Onan place $$$$. Mine isn't on a slide it has to come out the bottom. When I got it back I swapped it from the liquid side of the tank to the vapor port. Works like a champ now. Hopefully you don't have this same problem.

The liquid to vapor swap is supposed to eliminate the gumming up. Just a thought.