Converting Onan generator from gas to propane

A Gasoline powered Onan is exactly the same as a LP powered. The ONLY difference is fuel to run it Gasoline or LP. You read about problems with Gas powered Gensets because they are probably 95% of all RV Gensets. The ONLY problem with Gasoline Powered Gensets is the USERS fault, not a design problem. Gasoline Gensets need to be run at least 1 hour a month. This keeps the fuel from deteriorating and gumming up the Carb fuel jets. Same is true for Home lawn equipment. Don't properly treat and store your Gas powered Home appliances, you will have a ruined appliance. Having a LP powered Motorhome in a Gasoline and Diesel powered Motorhome LOWERS its resale value. LP powered gensets are limited by the size of the ASME LP tank on the motorhome. Usually the LP tank has no more than 25 to 27 liquid gallon capacity. LP powered Gensets consume 1.1 gallons LP at full load and about .7 gallons at 1/2 load. So this gives you at best 20 to 24 hours before LP tank refill. Even less if you are using onboard LP appliances. Gasoline Powered gives you 80% of the Gasoline tank capacity at .9 gallon 100% load and .6 at 50% load. You could go 3 to 5 days 24 hours a day. AND, LP gensets are also prone to problems from gummed up LP regulators. Especially when it is hot outside. Doug

Do you think the number of “horror stories” significantly out number the instances of people who have had zero issues? Of those with issues, how many have to do with fuel source versus issues due to no or poor maintenance?

It will make you sleep better than swap.

To make it feasible on a class A you'll also need to install a much larger propane tank. Mine is 65 gallons and is expected to provide about 50 hours runtime. I've never tried it that long.

I believe such horror stories involve portable generators and installed generators that rarely run. Proper regular exercise of a generator should prevent carb gumming.

Also getting motorhome non-removeable propane tanks filled can be a major pain..

There are kits to adapt an Onan to run on propane. Last time I looked they weren't all that expensive even. And didn't look all that difficult to install, but on a motorhome, access could be an issue.

In answer to the question "CAN it be done," the answer is yes. There are propane conversion kits for gasoline Honda generators. So converting gasoline to propane is possible.

The question "HOW is it done" is beyond my skill set. But, you may want to contact Hutch Mountain, they are one of the larger gasoline to propane conversion companies, and ask if they can help.