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-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Ethanol Free Gas - any cons? (https://www.offshoreonly.com/forums/general-q/372840-ethanol-free-gas-any-cons.html)

Smitty275 08-07-2021 03:33 PM
Originally Posted by Tractionless (Post 4800745)
How about if your fuel system components were designed prior to ethanol being added to fuel? That's my reason for non-ethanol.
Ethanol has been used in gasoline since the late 20's. Albeit not by all manufacturers. The govt mandated it in 2007. But there have been "up to 10% ethanol stickers on pumps since sometime in the 80's where I was from and probably all major metropolitan areas. Being you've got a '96, I would expect it to be compatible with gasoline containing ethanol. Or if nothing else the components that would be effected have been, or are due to be, replaced over the years.

Smitty275 08-07-2021 03:38 PM
Originally Posted by Tractionless (Post 4800745)
How about if your fuel system components were designed prior to ethanol being added to fuel? That's my reason for non-ethanol.
Ethanol has been used in gasoline since the late 20's. Albeit not by all manufacturers. The govt mandated it in 2007. But there have been "up to 10% ethanol stickers on pumps since sometime in the 80's where I was from and probably all major metropolitan areas. Being you've got a '96, I would expect it to be compatible with gasoline containing ethanol. Or if nothing else the components that would be effected have been, or are due to be, replaced over the years.

greg800le 08-08-2021 05:52 PM
From the 525 manual
 
https://cimg7.ibsrv.net/gimg/www.off...d0058a176.jpeg

ICDEDPPL 08-08-2021 10:48 PM
Originally Posted by underpsi68 (Post 4800639)
Like stated, the downside is more costly.

I'll go out on a limb here and say I only used ethanol fuel in my boat for the 9 years I owned it. I put marine stabil in every gallon I put in. I also stored the boat for the winter with a full tank with twice the marine stabil (long term-says lasts up to 2 years). When the spring came I just turned the key and went boating. Changed fuel filter once a year and always cut the old one open to inspect. Never any dirt or water. Always just good fuel.

I never had a fuel problem. Maybe I was one of the lucky ones.
You were lucky .


https://cimg4.ibsrv.net/gimg/www.off...1764e86fa0.jpg
https://cimg7.ibsrv.net/gimg/www.off...18451c3439.jpg

ThisIsLivin 08-09-2021 07:03 AM
That looks like a mechanical failure not detonation. I've seen a lot of pistons like that in snowmobiles after the crank pin needle bearing failed.

ThisIsLivin 08-09-2021 07:11 AM
I have always used a Tier 1 gas in the boat, more by chance than choice. Now that I know the difference, that's what I try to run in my cars and trucks too. I used to empty my tank at the end of the season and put it in my SUV. It always came out clean and clear, but I use Amsoil stabilizer and I have a really good water separator. My water separator has a drain valve that I check and I have never had any water in my fuel in 12 years.

underpsi68 08-09-2021 01:33 PM
IMO your situation is not a fair comparison. It appears you got stale gas. Who knows how old it actually was??

ICDEDPPL 08-09-2021 03:16 PM
Originally Posted by ThisIsLivin (Post 4800873)
That looks like a mechanical failure not detonation. I've seen a lot of pistons like that in snowmobiles after the crank pin needle bearing failed.
Preignition. The fuel I got was maybe like 60 octane junk or it was laquer, either way not a part failure

Smitty275 08-09-2021 05:41 PM
If you had preignition there'd be a hole in the middle or at least chunks missing around the top down to the ring land or severely rounded off. If it was detonation you'd see pecker marks in the carbon on top of the piston along with possible "sandpapering" of the piston top. That piston had something something solid bouncing around in there. Way too many different kinds of impacts. None of which are detonation or preignition related.

SB 08-09-2021 07:52 PM
You don’t think det or pre-ign could cause the valve head to over heat ?


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