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Old 09-13-2021, 04:50 PM   #1
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Default E10 Ethanol Fuel Problem?

Hi All,
We have recently seen the introduction of E10 Ethanol fuel here in the UK (that equates to 10% Ethanol being added to our petrol(Gas) at the pump)

Do any of you know if this will cause any problems to my Mercruiser 5.7 v8 fitted with a Rochester 4bbl carb and coupled to an Alpha 1 gen II ? As I can not seem to get an answer from anyone locally
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Old 09-13-2021, 05:29 PM   #2
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Iíve been using E10 in my 1997 5.7 with a Weber carburetor since 2008 without issues. Just be sure to add stabilizer for long layups such as winterization.
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Old 09-13-2021, 05:39 PM   #3
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Hi Mike,
Thanks for your reply. This helps to put my mind at ease, as here in UK this is creating a lot of concern, with some just opting to use the more expensive SUPER UNLEADED fuel as this does not contain 10% Ethanol.

Jamie.
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Old 09-13-2021, 06:10 PM   #4
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Quote:
Originally Posted by Maxum2300scr View Post
Hi Mike,
Thanks for your reply. This helps to put my mind at ease, as here in UK this is creating a lot of concern, with some just opting to use the more expensive SUPER UNLEADED fuel as this does not contain 10% Ethanol.

Jamie.
Hi Jamie,

When E10 first came out there was similar concerns here in the US. Some older boats did have issues with fuel lines and fuel tanks made of a plastic resin that the alcohol attacked. The result was a gooey mess in the fuel system and engine. Worst case for you would be replacing any rubber fuel line with new line rated for E10. I did not have to do so in my boat.
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Old 09-13-2021, 06:25 PM   #5
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Hi Mike,

Thanks I will check the fuel line, does this also apply to the larger filler pipe to the tank? I have an aluminium tank so hopefully no concerns there.

Jamie
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Old 09-13-2021, 07:06 PM   #6
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Yes it can apply to the fill line but fuel doesnít spend much time in it so it less of a concern.
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Old 09-13-2021, 08:04 PM   #7
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Quote:
Originally Posted by mmwjr View Post
Iíve been using E10 in my 1997 5.7 with a Weber carburetor since 2008 without issues. Just be sure to add stabilizer for long layups such as winterization.
I have not had any issues using E10 in my 95 2400.
Just do as Mike recommends.
Don
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Old 09-20-2021, 02:59 PM   #8
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What year is the boat? If the fuel line is a pre-ethanol era fuel line, I would replace it with one designed to handle ethanol. I use either Startron or seafoam along with Stabil for marine gas engines specifically for ethanol, with each fill up.
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