Hi gang,I have a 2006 Keystone Raptor 2617 with the Onan 5500 gen-set. I am ashamed to say that I am just over 500 hours and am just now changing the fuel filter and spark plugs. Oil and air filter has been changed as per the maintenance directions. The fuel filter is needing replaced due to leaking but the plugs were all black/soot covered...My question is this, does anyone have a recommendation regarding a fuel additive/cleaner for the cylinders, valves etc. I store the vehicle with stable and each year until this year it started very quickly.I will have the plugs and filter replaced in the next few days as time allows... Thanks in advance..Dean

I always store mine with marine satbil and use seafoam in the tank for camping season.

Dean, Sta-Bil does the preservative part, but nothing else. You can get a can of SeaFoam, which will keep carb or jets cleaned and preserves the gas also. I have been using the SF for years in all my engines, and have yet to have a problem. Another thing that I also do is buy ethanol free gas for all my gens, lawn equipment, blowers, and Honda outboard. My neighbor used the ethanol in his 4 stroke outboard and within no time it was at a complete stop....and abouy $1100.00 later he was on the road. There might be other products out there, but I found the SF and it has proven a winner. Safe travels.

Thanks Gents.. SF seems to be quite popular and I will likely be applying an application asap. This generator in its heyday would run 12-15 hours a day at a filthy dirty drag strip, I likely should have been using this sooner but alas, hindsight is 20/20.. so my dad always said..

Better late than never.....your engine will thank you!!Running it with a load every month, to exercise it, will be greatly appreciated too!:)

Our TH has a 30 gal toy fuel tank, and 20 gal gen fuel tank. I use the marine Stabil in every fill up, and since we don't use the gen often enough I run it once a month for an hour varying with no load, up to both 15K ac uits, and back down to no load. Also I fuel our lawn mower off the toy tank so I can rotate fuel quicker than just the gen uses.So far so good. I have considered adding Marvel Mystery Oil to the fuel to help protect the steel fuel tanks, but I try to keep them full to help cut down on condensation buildup.

Generator fuel additives.. yeah or nay | Good Sam Community

Bedlam
Moderator
May 30, 2013
Higher octane fuel has a higher flash point designed for higher compression or higher temperature engines. This prevents predetonation or ping in your engine and has nothing to do with with how clean it burns.
Dirtclods
Explorer
May 30, 2013
Higher octane fuel run cleaner and better under a load.
micahmiles
Explorer
May 30, 2013
Do not run "premium" high octane fuel, as a prior post stated, unless you just like wasting your money. Your 8:1 compression genset has no need for it and it will not benefit you or your genset at all.
lawnspecialties
Explorer
May 28, 2013
We have a full tank of fuel in the Cyclone right now with some Lucas ethanol treatment. Next week, we race and it'll probably burn 20-25 of the 30 gallons of fuel over the weekend.

If I add some SeaFoam, will that cause a problem mixing with the Lucas ethanol treatment? If so, I'll just wait. But we don't race again until late August so it'll be awhile before I get the chance.
Eyetattoo
Explorer
May 28, 2013
K6DKO wrote:
This is a question. The last time I had my Gen worked on, the The guy told me he ran something through the fuel line that cleans carbon out of the intake and heads. Does any one know what that stuff is??
Probably SeaFoam or something similar.
N6WT
Explorer
May 28, 2013
This is a question. The last time I had my Gen worked on, the The guy told me he ran something through the fuel line that cleans carbon out of the intake and heads. Does any one know what that stuff is??
Strabo
Explorer
May 28, 2013
Run premium gas in your genny, and use a quality fuel.
mapguy
Explorer
May 22, 2013
Ethanol free gasoline from the Cenex store plus Stabil long term dosage and SeaFoam at 1/4 dosage. Also try to exercise once a month -if it sits that long. Don't use the generator very much.
maak95
Explorer
May 22, 2013
grizzly660fan wrote:
I use star-tron to reduce ethanol problems and stabilize. my generator and toys seem to really love the stuff.

x2
grizzly660fan
Explorer
May 21, 2013
I use star-tron to reduce ethanol problems and stabilize. my generator and toys seem to really love the stuff.