Fuel for the 7.4 Merc

[Protip]

Our boating season is in full swing now. Going out for a full day again on Sunday and am going to have to fill up for the first time in the new (to me) boat. I don't need to run premium in it right? Will be getting marina gas since my trailer deal fell through so it should all be no ethanol.

[cmattj]

Our boating season is in full swing now. Going out for a full day again on Sunday and am going to have to fill up for the first time in the new (to me) boat. I don't need to run premium in it right? Will be getting marina gas since my trailer deal fell through so it should all be no ethanol.

87 is fine. E10 is common so no worries there either. Every state is different.

So go fill her up.. don't ask how much.. just sign the paper and tell the person you don't need a receipt! Have fun

[Ytmsn]

Matt... Ethanol is $#!+. Jus sayin....

[thunder550]

Yep 87 is good.

As long as condensation isn't allowed to collect inside the tank, is E10 really that bad either?

[cmattj]

Matt... Ethanol is $#!+. Jus sayin....

I said its common.. never said it wasn't mmmmm How did you Curse legally?? OH thats right..... S#!T
were going to Detention for that one.

Yep 87 is good.

As long as condensation isn't allowed to collect inside the tank, is E10 really that bad either?

I don't think 10% is that bad if you keep using it and burning through it.

The Problem is that E10 is a water sponge as you know. And open fuel systems like Boats are awful for that.(they pull moisture even with no Ethanol in the gas when they just sit around) .

So company's make additives to offset that . Or if we just let set it for a few months.... turns to s#!t. (that was legal cursing)

Remember how you where changing fuel filters a lot. ? should I pick up a mid season surge at steady speed first thing id try is replace the fuel filter, and I start with a fresh Fuel filter every year anyway as im sure most everyone does.


It could be worse.... Flex-fuel or E85 requirements next?? then what

[Big Block Power]

Matt your awesome. Detention you Yt and that T5554554555500000 guy.
Most marinas run premium. So just watch what octane they use. Not that it matters just saying that why you pay more also.
E10 doesn't go in my boat.It's easy for me to get it without it here. We freeze our real gas here in the north plenty of it. Ethanol/Alcohol let's face it. It's a cleaner and a non lubricator so after awhile depending how old your system is it is not set up for ethanol and may fail early because of that. You also lose performance from it unless your engine is set up to race with it line Matt likes too.

[Ytmsn]

Dang BB. You're in full bloom today. What scares me is I almost understood most of that post

[Tuscany]

Ethanol is corrosive.
We all run it every day in our vehicles, which is fine. Goes in, we burn it, and fill up again consistently. But ethanol in a vehicle that may sit for extended amounts of time can lead to trouble.
Personally, I only use ethanol free 91 in my recreational engines.

[Big Block Power]

Dang BB. You're in full bloom today. What scares me is I almost understood most of that post

Yep and I just woke up.I showered first. Maybe that helped. Off to my work to help my kid buy a new Ram

[Big Block Power]

Ethanol is corrosive.
We all run it every day in our vehicles, which is fine. Goes in, we burn it, and fill up again consistently. But ethanol is a vehicle that can sit for extended amounts of time can lead to trouble.
Personally, I only use ethanol free 91 in my recreational engines.

Yep same here. Snow blower and mower don't get ethanol gas.

[cmattj]

Ethanol is corrosive.
We all run it every day in our vehicles, which is fine. Goes in, we burn it, and fill up again consistently. But ethanol is a vehicle that can sit for extended amounts of time can lead to trouble.
Personally, I only use ethanol free 91 in my recreational engines.

Yep same here. Snow blower and mower don't get ethanol gas.

+1. 91 here too.... Some Boat technology sees ping and knock and will reduce the timing automatically during that key cycle.. Who wants that hahah

Whats a snow blower?

[AsLan7]

Our boating season is in full swing now. Going out for a full day again on Sunday and am going to have to fill up for the first time in the new (to me) boat. I don't need to run premium in it right? Will be getting marina gas since my trailer deal fell through so it should all be no ethanol.

.

Like the others mentioned above, that's correct protip.

From page 1B-14 of the 1999 Mercruiser 7.4L service manual:


https://d3gqux9sl0z33u.cloudfront.net/A ... _litre.pdf

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[Protip]

Great, thanks guys.