I have about 3/4 of a fall tank of gas in my boat, and I added a full can of Seafoam to the tank when the gas tank was full. It looks like I won't be getting out to much more with my boat, and wanted to add some Stabill to the gas to make sure it didn't go bad over the winter months.
Can you add to much fuel additive to gas and do harm to your outboard? So if I already have Seafoam in the gas, and I add half a can of Stabill, will this do any harm?

I've talked to a few guys and they said they would diffantly add some Stabill to the gas to make sure it doesn't go bad for next Spring.

Why not start siphoning the gas out of your boat tank, and use it in your cars/trucks? I disconnect my fuel line at the motor, and fill a 5 gallon gas can at a time. This way, the boat gets fresh gas in the spring.
HRG

I've mixed stabil with seafoam a number of times at the end of the year with no adverse results. Seafoam alone will stabilize your gas for the 3-5 months you will store the boat. I don't know what it will do with the ethanol that they've added to the gas over the last couple years, I'll add some marine stabil before storing it this winter.

I stopped using Stabil years ago and have gone strictly with Seafoam in all my toys!! I have not ever had a problem yet!! Outboards, snowmobiles, motorcycle, lawnmowers, etc... It has worked great for me.

Been using both for many years now with no problems, I have a chain saw that gets started maybe every two years or longer and it runs fine with this mixture.
Maybe overkill, don't know, but it works for me, I use seafoam on a regular basis to keep things clean and add stabil when storing.

I've doubled the amount reccomended with no problems, I think to use too much of it you'd really have to add a lot??

I've seen people spray seafoam into the air intake to clean carbs out, can't say what it does, but they seem to think it helps.

Al

No need to add Stabil if you are using Seafoam. It will stabilize fuel for storage.
http://www.seafoamsales.com/motorTuneUpTech.htm
My bost dealer recommends Seafoam instead of Stabil.

Contact your engine manufacturer. Excess stabilizer may plug your fuel injectors. My engines are carburated, so I don't concern myself.
Wallhanger may have the best idea.

I fill up my boat and use Seafoam period. Only reason I leave the gas in the boat is to keep the tank form condensation. Done this for several years now. No problem at all. Skeeter

Be interesting to find out what excessive is, I have a 40 gallon tank and wonder if they mean adding a pint or gallon or?? to be considered excessive?

Al

Thanks for the link to Seafoam. I read on the can that it stabilizes fuel, but some friends still say to put Stabill in with it if storing over the winter.
It sounds like plenty of you just store the boat over the winter months with just seaform and have no issues, so I'll probably do the same.
Thanks

Seafoam vote from me: 5 years, 3 different boat motors, several small engines - no fuel related issues over the storage months for me here in Michigan

When approaching the end of the season I start treating the gas with seafoam so that whenever I stop for the year I've been running treated fuel though the HPDI engine. I've been doing this for years and have yet to have an issue. Seafoam is a great product for helping to resolve engine operating issues as well.

I contacted Sta-Bil. They said you can actually use up to triple what they recommend with no problem. I used both. I like Seafoam the clean stuff. I usually use Stabil for storage.

Another good tip is to use non-oxygenated gasoline in your fuel tank. All gasoline sold in MN contains 10% ethanol (E-10) and it doesn't store very well. You can find non-oxy at quite a few gas stations and marinas these days. A lot of BP stations seem to carry it. Defintely use Sea Foam, but it helps to use the non-ethanol fuels for long-term storage. I recently installed a water/fuel separator and it was interesting to see what was in the filter canister when I changed it last week after only about 5 hours of run time on it. When I replaced the filter, I dumped the old one and a few ounces of water was in the canister - this was with non-oxy fuel in my tank. I think I would have had more water in the fuel had it been E-10.

dave i just filled my tank with non-oxy im here in mn also and a buddy of mine said that all gas no matter what has ethanol unless i goto wisc. i thought non-oxy is supposed to be ethanol free?

I always thought that all gasoline in Minnesota had ethanol except "Premium". Most of the stations with "Premium" also have a label that states for collector cars, boats, snowmobiles ect.... or something to that effect. I have always used "Premium" for everything I own except my auto's.

dave i just filled my tank with non-oxy im here in mn also and a buddy of mine said that all gas no matter what has ethanol unless i goto wisc. i thought non-oxy is supposed to be ethanol free?

The non-oxy fuel in MN is ethanaol free. There is a sticker on the gas pump that says something like "For use in small engines and collector cars only." It is usually 91 or 92 octane, so it is considered premium fuel. Not all premium fuel is non-oxy, so you have to look at the pump to see if it has the "non-oxygenated" statement.

dave i just filled my tank with non-oxy im here in mn also and a buddy of mine said that all gas no matter what has ethanol unless i goto wisc. i thought non-oxy is supposed to be ethanol free?

Interesting article: http://www.fuel-testers.com/ethanol_problems_damage.html

thanks for the info yeah i bought the gas at a bp station it was not with normal pumps in was with a kerosene pump. and also it was an orange pump not green and it was 91 octane but it just said non-oxy and nothing else.

I contacted Sta-Bil. They said you can actually use up to triple what they recommend with no problem. I used both. I like Seafoam the clean stuff. I usually use Stabil for storage.


Thanks, was wondering was to much was, I tend to figure out what's needed then add a glug or two... :)

I haven't seen non oxygenated fuel here in Minn that wasn't premium, least that I can remember.

Thinking this year I might run the tank down and add 10-15 gallons of premium and see how that goes, not sure if its better to have a full tank or not?

Al