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About That E10 Fuel You're Using

Old 06-10-2021, 09:49 AM
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This is what it looks like when a fuel tank fails with E10 fuel and water gets in the fuel:




Old 06-10-2021, 10:27 AM
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Ethanol is hygroscopic, having it exposed to air is going to cause it to attract and capture water. Each case will be different but general rule longer the exposure, the more chance of problems. For open vented tanks such as in boats and lawn equpiment it is about the worst oxygenator possible for gasoline. 2strokes take the brunt of the problems, right before phase separation the water trapped in the ethanol does not want to mix with the oil. Overheating can become a problem. Also tends to cause lean out conditions much more often. 4strokes handle running lean much better then 2stroke. Never ending problem at work from compactors, water pumps, generators, chop saws, chain saws, etc... destroys them fast if they sit to long. Try to not to use mix gas with ethanol but often no choice.

Last edited by Jeepman; 06-10-2021 at 10:32 AM.
Old 06-10-2021, 01:09 PM
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Aside from problems when everyone in new England had to convert in 2005 it's been smooth sailing for me. Keep your tank full and use your boat and it's fine.
Also, The new EPA compliant tanks in boats are not open to the atmosphere to the same extent as old tanks so it's not much of an issue in newer boats.

Last edited by jbg108; 06-10-2021 at 01:14 PM.
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Old 06-10-2021, 01:15 PM
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we spend the $35/bottle of yamalube for peace of mind
Old 06-10-2021, 01:42 PM
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Originally Posted by Thalasso View Post
Really. Where do you live?
I'm in Semmes, Alabama. I have a friend that runs a tuning shop out of Pensacola (but does tunes in multiple locations throughout the southeast) and he has seen numbers from 13-17% regularly, 19.2% was the spike he saw in April (and put a photo of on Facebook) from a station in Jackson, Alabama. Another guy in Texas read 20% directly out of the pump at his local station so that's not even factoring in any errors in vehicle sensors at all; that's straight out of the pump into your tank folks. All flex fuel vehicles have an ethanol sensor and can read the ethanol percentage of the fuel and adjust the tuning of the vehicle accordingly, so this info comes up with a good scan tool or a tuner can pull this info for you (and also your dealer could as well.) Some stations sell E10, E15, even E30, as well as E85. You start mixing that stuff up and you end up with these weird amounts that exceed E10. All of this causes lean conditions and hotter running engines that get less fuel mileage.
Old 06-10-2021, 03:08 PM
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Originally Posted by Makomyday25 View Post
Great explanation of whats going on, although its not identical to whats actually happening inside a boat gas tank. However if your boat sits a lot, (or anything for that matter that has an "open vented" tank) non ethanol fuel would be my choice. My boat sat for 2 years without moving and has only had non ethanol in the tank, 120 gallon tank left at 50% fill. Not one drop of water in the racor, fuel smelled like new, and engine fired right up.
Just bought a boat that had sat for 3-4 years. Was told if had little to no fuel, but if it did - it was ethanol fuel. Put in 10 gal of old gas to stir up any sediment or sludge, then drained the tank. I got 11 gal of water and 15 gal of fuel.
Old 06-10-2021, 04:22 PM
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Originally Posted by Furbird View Post
I'm in Semmes, Alabama. I have a friend that runs a tuning shop out of Pensacola (but does tunes in multiple locations throughout the southeast) and he has seen numbers from 13-17% regularly, 19.2% was the spike he saw in April (and put a photo of on Facebook) from a station in Jackson, Alabama. Another guy in Texas read 20% directly out of the pump at his local station so that's not even factoring in any errors in vehicle sensors at all; that's straight out of the pump into your tank folks. All flex fuel vehicles have an ethanol sensor and can read the ethanol percentage of the fuel and adjust the tuning of the vehicle accordingly, so this info comes up with a good scan tool or a tuner can pull this info for you (and also your dealer could as well.) Some stations sell E10, E15, even E30, as well as E85. You start mixing that stuff up and you end up with these weird amounts that exceed E10. All of this causes lean conditions and hotter running engines that get less fuel mileage.
E30 is a premium fuelknown for its high octane. You need this for tunes. It is derived from mixing E85 and regular gas ( non ethanol) in a specific ratio
Benefit of E30 is that you can run more spark, that is where most of the power comes from.
Old 06-10-2021, 04:26 PM
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Originally Posted by Furbird View Post
I'm in Semmes, Alabama. I have a friend that runs a tuning shop out of Pensacola (but does tunes in multiple locations throughout the southeast) and he has seen numbers from 13-17% regularly, 19.2% was the spike he saw in April (and put a photo of on Facebook) from a station in Jackson, Alabama. Another guy in Texas read 20% directly out of the pump at his local station so that's not even factoring in any errors in vehicle sensors at all; that's straight out of the pump into your tank folks. All flex fuel vehicles have an ethanol sensor and can read the ethanol percentage of the fuel and adjust the tuning of the vehicle accordingly, so this info comes up with a good scan tool or a tuner can pull this info for you (and also your dealer could as well.) Some stations sell E10, E15, even E30, as well as E85. You start mixing that stuff up and you end up with these weird amounts that exceed E10. All of this causes lean conditions and hotter running engines that get less fuel mileage.

Exactly.

Even 10% ethanol blend is not rigorously controlled.
It's actually done in line. People with test kits have found ethanol amounts all over the place even super high.....30+%>

One only needs to read about Mercurys study of the effect of 15% ethanol on outboards to have concern. Self-destruct by only 300 hours . Runs hotter and results in severe varnish build up in the engine.

And now a lot of stations are carrying the e85... Which the boat industry has had to lobby against requiring,specifically because it will kill people's engines
Old 06-10-2021, 04:35 PM
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Guess Merc better up there game
Old 06-10-2021, 04:41 PM
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Originally Posted by Thalasso View Post
Guess Merc better up there game
Not just Mercury.

Engine run okay with 10% ethanol but anything more is extremely bad for them
https://www.google.com/amp/s/www.tra...level-gasoline


The studies tested the effects of 15 percent blended ethanol, or E15, on performance, emissions and durability. In all cases E15 had catastrophic effects, leading to increased emissions, deterioration and in most cases complete engine failure.

Go ahead, trust that you're only getting 10% at that pump....

Last edited by mbb; 06-10-2021 at 04:52 PM.
Old 06-10-2021, 07:56 PM
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Originally Posted by Thalasso View Post
E30 is a premium fuelknown for its high octane. You need this for tunes. It is derived from mixing E85 and regular gas ( non ethanol) in a specific ratio
Benefit of E30 is that you can run more spark, that is where most of the power comes from.
I am fully aware of this. However we are talking about fuel percentages being pumped out of stations displaying "E10" on the pump or the old standard disclaimer of "may contain up to 10% ethanol" or whatever your local station has on their blended fuel. E30 specifically states "E30" at the pump.
Old 06-10-2021, 08:08 PM
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I was running E10 in my pick up for years. Last week I hit a deer with just the tip of my bumper.

I've never hit a large mammal with my vehicle, so it's probably the E-10 gas' fault. isn't that Biden's fault?

Anyone else in the blame game?
Old 06-10-2021, 08:09 PM
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Just be carefull if you have always used rec90 in a tank and switch to e10 or 15. You better have a boatload of fuel filters . The e10 will essentially clean all the sludge out of the bottom of the tank and suspend it in the new fuel clogging everything up.
Old 06-10-2021, 10:31 PM
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Ethanol gas isn't that big of a deal if you're running a fuel injected four stroke. It's also not that big of a deal if you're not in a high humidity area like the south where it absorbs a bunch of water. Combine a carburetor and the south and you'll have more problems than you can throw a dead cat at. I'm from Mississippi, ethanol pretty much killed every small engine I've had over the last 20 years until we started getting easy access to non-ethanol fuel and they started putting fuel shutoff switches on most small engines. I now run only 92 octane non-ethanol in all my small engines and either dump the fuel or turn the shutoff switch and run until it quits after using. Since I've been doing that my problems have disappeared.

Ethanol fuel is of the devil unless you're in a low humidity area or running it in a fuel injected engine.
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Old 06-11-2021, 02:57 AM
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As much as we run the boat, I would run E10 if I could. Being that there is only non ethanol on the water, that's what I've always ran. I was always worried to go back and forth between the two.
Old 06-11-2021, 06:27 AM
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Originally Posted by mbb View Post
Not just Mercury.

Engine run okay with 10% ethanol but anything more is extremely bad for them
https://www.google.com/amp/s/www.tra...level-gasoline


The studies tested the effects of 15 percent blended ethanol, or E15, on performance, emissions and durability. In all cases E15 had catastrophic effects, leading to increased emissions, deterioration and in most cases complete engine failure.

Go ahead, trust that you're only getting 10% at that pump....
Well that is why i said they better up there game because like it or not it's already here and they want to increase it even more

https://www.desmoinesregister.com/st...0for%20drivers.
Old 06-11-2021, 11:01 AM
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Ethanol is always been nothing but a boondoggle for businesses with politicians in their pocket

10% less cost for 10% less mpg. And sheet loads of problems



Old 06-11-2021, 11:02 AM
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Ethanol is always been nothing but a boondoggle for businesses with politicians in their pocket

less cost for less mpg. And sheet loads of problems






Old 06-11-2021, 11:11 AM
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I’ve used nothing but e10 in both my new boats for the past 7 hrs and never once a fuel related issue.
Old 06-11-2021, 11:42 AM
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None of this addresses the real problem with ethanol in boats. If you’re using 1/3 of fuel to run, 1/3 of your fuel to return and keeping 1/3 in reserve the turnover rate is extremely low compared to what you can do in your truck or lawnmower. If you boat every day it’s fine, every couple weeks and you have an ethanol storage problem.

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