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Engine fogging for fuel injected engines?

Old 08-18-2015, 07:31 PM
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Default Engine fogging for fuel injected engines?

Is it really necessary to fog a fuel injected engine these days for winter storage or is this a holdover from carburetor engines? With fuel injection cylinders no air or moisture can get into the cylinder so why fog unless very long storage is planned? If fogging is recommended what length of time in storage makes this a good thing to do?
Old 08-18-2015, 07:35 PM
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Owned the boat below since new and never fogged the motors.
Old 08-19-2015, 05:54 AM
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I don't see any answers so maybe my theory is correct no one really knows the answer. I was expecting some sage advice as is usually offered here along with the usual personal experiences.
Old 08-19-2015, 06:07 AM
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Originally Posted by jerryclaybrook View Post
Is it really necessary to fog a fuel injected engine these days for winter storage or is this a holdover from carburetor engines? With fuel injection cylinders no air or moisture can get into the cylinder so why fog unless very long storage is planned? If fogging is recommended what length of time in storage makes this a good thing to do?
this fall will be my first time winterizing my new yamaha F150 ...i have a small portable tank that i am going to hook up to the built in fuel filter. I am going to buy the 40:1 non-ethanol gas from lowes and run the motor on that for about 10 minutes or so. I may take the plugs out and squirt some fogging in and crank it over...and that should do it. My fuel tank will be almost filled and treated with stabilizer. yes the oils will be changed as well.
Old 08-19-2015, 07:26 AM
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air will get into the cylinders when a valve is open and on a 4 stroke most will have at least one partially open. Follow the manufactures recommendations. I fog mine.
Old 08-19-2015, 07:33 AM
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My manual says to spray fogging oil directly into the cylinders so that is what I do. Suzuki DF140.
Old 08-19-2015, 07:41 AM
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Fogging is not just for carb engines. What is fogged is the front half of the engine, and cylinders to keep condensation from forming rust on the polished surfaces of the crank, cylinders, and bearings.
You can't hurt it by fogging, but you can hurt by not fogging under some conditions.
Old 08-19-2015, 07:43 AM
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The same reasons for fogging (or not fogging) exist with EFI as with carbs. The manner of doing it is different. Some hook up a remote fuel source, some fill their water separator with an oil/gas mixture, some spray directly into the cylinders via spark plugs, and some do nothing at all.

In recent years I have started to do nothing at all, but my winter layup is around 4 months, and sometimes even with garage storage. I'm sure that there are horror stories, but I know many who do not fog and who have never had an issue. Best advice is to follow your engine's recommended winter layup procedures.
Old 08-19-2015, 05:40 PM
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I am having the same dilemma posted a question got some smart ass answers my concern was what the fogging oil will do to the catalytic converter and the o2 sensors I know what the manual says but I also noticed the cat is not covered under warranty also stabil 360 claims to coat and protect the fuel injectors . I have pulled car engines apart to use for rebuilds that sat for years in a pile outside and the cylinder walls weren't rusted I don't see how the inside of a motor will rust sitting in a garage for 4 months .

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