Originally Posted by makitso
I Live in the Tucson area and plan to not use our new RV for 5-6 months.
What is the best practice for ensuring that the generator will start after this period?
I have seen recommendations to run the generator for one hour every month, run the generator with a mixture of Seafoam and gas and the let it sit. Quite frankly, in the past, I have just stored four cycle engines for the winter by disconnecting the gas and then run it till it kills.
My ONAN manual recommends running generators at a minimum of 50% capacity for 2 hours every four weeks.
It mentions that gum and varnish can begin to accumulate in gasoline carbs in as little as 30 days, but it does not address fuel stabilizers. I've seen mixed real-world testing results from fuel stabilizers (see YouTuber "Project Farm" for one such test), but I've apparently had good luck with Stabil for a variety of 4-stroke engines that have been stored for up to 6 months. That may be due more to luck than any positive effect from Stabil.
My experience with leaving engines for longer periods of time is mixed. Sometimes I've been able to just empty out the old fuel and add fresh fuel, but other times I've had to pull and clean the carb.
I'm fairly comfortable taking apart and cleaning carbs, so I haven't worried about it too much for most of my small engines. That said, I had an Onan service tech tell me that they do NOT sell rebuild kits for their gasoline generators carbs. I didn't try to verify that, but took care to change out the fuel and exercise my Onan 5500 regularly just in case he was correct.
Our toy hauler had a fuel station, so I set a monthly calendar event to exercise the generator then pump any remaining fuel into the lawn tractor, mower, car, etc. to empty the tank, then dumped in 10 or 15 gallons of fresh fuel (with Stabil, just in case it actually helps). I'll admit that I didn't get around to doing this every month, but I did manage to do it most of the time for the years that we owned the toy hauler. Was this overkill? Perhaps...but the generator had over 2500 trouble-free hours on it when we sold the toy hauler. The fuel station made changing out the fuel really easy. It would have been quite a bit more tedious to use a siphon.