Seafoam problems?

Been treating Mo Ho fuel tank for 5 years due to it being parked for extended periods. I had one sensor fail out of four, didn't even think about seafoam causing it to fail. I do buy top tier gasoline and these fuels contain techron.
Sure helps genny from gumming up. I also use it in everything. Small engines especially.

Most likely those folks were or were going to have a problem anyways. Seafoam just does a major cleaning job on everything including the sensors. Never ever heard of it damaging a sensor and I know several mechanics that swear by it. I have used in in everything from my lawn mower and generator to my Dodge Cummins.

if things are runing good?? nows the time to use sea foam, not after you have the problems. keep the system clean and you won,t have problems.

path1 wrote:


I've got Owan 4000 and .....

And I've also wondered gen doesn't have a oil filter? I guess that makes changing oil so much more important IMO.

Sounds like it's maybe a Microquiet 4000? If so, there's no oil pump to develop oil pressure to push oil thru a filter, thus no oil filter. It's splash lube, like a lot of lawn mowers and early cars. Yep, clean oil & proper oil level are extra-important on these.

Jim, "Mo' coffee!"

If you have enough junk in your engine that cleaning it will cause an issue with your O2 sensor then NOT using Seafoam will be a bigger problem than a bad sensor IMHO.

I've been using it routinely in everything I own, including the company fleet, for more than 30 years.

I'm still waiting for all those terrible things to happen to me. ;-)

path1 wrote:

My initial purpose for it was the generator,I think i will leave it at that purpose.

I've got Owan 4000 and at the time of changing the gen's fuel filter I picked up several feet of hose and ran seafoam gas mixture out of gallon gas can. I had to take off fuel line anyway to change filter on mine. Gen seemed to run better after that. Just ran it till gallon gas can was empty then did it again (2 gallon total)maybe 3 hours.

I don't know about other RV's but my gen has it's little separate gas line going into chassis fuel tank.

Then I got really carried away and seafoamed everything I have that is carb'd. Even called Seafoam and asked about Coleman lantern, they said "sure I do it all the time" so did my Coleman lantern.

Couple days later a man on this forum, that is heavy into collecting lanterns sent me PM saying seafoam is bad for newer lanterns because the material that Coleman now uses on the gas cap.

But everything seemed to work better. Got the seafoaming "thing" out of my system and will probably use it again. But not on anything fuel injected.

My gen used to run very bad. After cleaning up all connections and wires, I put in new plug, air filter, oil and gas filter and I have a calendar that is circled on what it is due to get exercised. And I follow manufacture directions on exercising it. Runs like a charm now.

And I've also wondered gen doesn't have a oil filter? I guess that makes changing oil so much more important IMO.

Thanks for the info.Just to much of a risk to have something to happen to the o2 sensor or the catalytic converter.Even on the mainsite on seafoam faq it had folks asking about issues with check engine lights and o2 sensors.So i think its best to keep it away from the engine.

My initial purpose for it was the generator,I think i will leave it at that purpose.

I've got Owan 4000 and at the time of changing the gen's fuel filter I picked up several feet of hose and ran seafoam gas mixture out of gallon gas can. I had to take off fuel line anyway to change filter on mine. Gen seemed to run better after that. Just ran it till gallon gas can was empty then did it again (2 gallon total)maybe 3 hours.

I don't know about other RV's but my gen has it's little separate gas line going into chassis fuel tank.

Then I got really carried away and seafoamed everything I have that is carb'd. Even called Seafoam and asked about Coleman lantern, they said "sure I do it all the time" so did my Coleman lantern.

Couple days later a man on this forum, that is heavy into collecting lanterns sent me PM saying seafoam is bad for newer lanterns because the material that Coleman now uses on the gas cap.

But everything seemed to work better. Got the seafoaming "thing" out of my system and will probably use it again. But not on anything fuel injected.

My gen used to run very bad. After cleaning up all connections and wires, I put in new plug, air filter, oil and gas filter and I have a calendar that is circled on what it is due to get exercised. And I follow manufacture directions on exercising it. Runs like a charm now.

And I've also wondered gen doesn't have a oil filter? I guess that makes changing oil so much more important IMO.

path1 wrote:
Didn't mess up 02 but did free up some junk and plugged the fuel filter and fouled #2 injector.

Most people have no problem and like the stuff.

I do like what it did to carb engine like Generator, runs a lot better IMO.

Thanks,I was gonna use it in the tank but since reading the possibility of missing up the o2 sensor and not counting plugged fuel filter and fouled injectors like you said.I feel its to much risk.Especially since my motor runs pretty good at the moment.My initial purpose for it was the generator,I think i will leave it at that purpose.

mayo30 wrote:
Where did you read those threads.What exactly is happening to mess up the O2 sensors,do you have to replace them?I'd like to know as I use it and want to recognize the problem when it happens.How was the seafoam applied or introduced to create the problem?

just google.Does seafoam harm o2 sensor.You will see all the treads.Some have had luck with just resetting the code and some have had to replace it.

Been using it for 5 years and never had any problem, with either a TB injection or a rail injection system. Does clean better than any other I have used and also works very well as a preservative.