Have not done the conversion. So take this for what it's worth.
* Propane will increase your fuel consumption by 20-25% (ballpark)
* It may not work very well or at all, during cold temperatures.
* You'll make less power with propane, typically - probably only an issue at higher altitudes where power is further reduced.
* It'll get rid of any ethanol/carb problems.
I've owned 3 5500 Onans. I've never had issues with Ethanol in the gas, probably because I stabilize (marine stabilizer) every single drop of gas that goes into the RV or I use non-ethanol fuel (AV fuel or other). I also run that generator at a minimum of once every 45 days.
If I was going to let it sit, I'd disconnect the fuel pump (or put in a disconnect switch) and run it out of fuel... Or I'd drain the bowl. The fuel in the tank, stabilized, is probably good for 12 months.
Can really respond to "hard start" issues - haven't had them... Yet.
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