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Winterizing...running an EFI 4-stroke till stall...

Old 11-26-2020, 09:55 AM
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Default Winterizing...running an EFI 4-stroke till stall...

I have my first EFI 4-stroke and I'm reading a lot of threads that say use a fuel stabilizer then run till warm then disconnect the fuel line and let it stall. I thought this would be bad for an EFI because the HP fuel pump inside the VST runs dry and can damage the pump. Is my thinking flawed?

Old 11-26-2020, 09:57 AM
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Wonder what the mfg recommends?
Old 11-26-2020, 10:07 AM
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**Maintenance Matters**

Last edited by CTXOK; 11-26-2020 at 10:45 AM.
Old 11-26-2020, 10:15 AM
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I say treat the gas with a storage rate of stabil and add fresh non ethanol to tank to stir it up
Run it awhile to get it thru the entire fuel system and turn off the key.
You want to keep the fuel system full of the stabilized mix.
My vote is so not run it dry but do stabilize , always
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Old 11-26-2020, 10:54 AM
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I used to live in Chicago. My boat came out of the water in early OCTOBER. Before I left the Marina I put enough STABIL IN FOR 110 GALLONS, filled the tank, took it out for a 10 minute run so the STABIL could mix in with the gas and get into the fuel lines and into the carb. After that it went home where I finished all the winterizing chores and sat on the trailer until it went back into the water in mid APRIL. It would start right up just like it would after sitting for a week. I did this for 24 years.
Old 11-26-2020, 10:56 AM
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Did you get the handbook with the engine?
Old 11-27-2020, 09:03 AM
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Originally Posted by Clinker View Post
Did you get the handbook with the engine?
The Tohatsu manual says to add 1-tsp of engine oil to each cyl and turn over the engine without the plugs. I thought that was a big no-no for 4-strokes but was going to do in anyway along with draining the VST. I'm worried about the fuel left in the engine mounted fuel filter, fuel pump, fuel rail, etc. It doesn't say anything about spraying fogging oil in the intake or running till stall. I've been bitten so much from ethanol fuel, I just guess I'm gun shy. When in doubt, follow the manual...
Old 11-27-2020, 01:55 PM
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Why would dumping or spraying fogging oil in each hole and turning it over without the plugs be a big no no? Put some marine stabil in the tank, run engine, remove plugs, spray in some fogging oil, crank over, install plugs. Done. Do not run it dry.
Old 11-27-2020, 02:40 PM
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😀 nevermind

Last edited by weaks4u; 11-27-2020 at 02:52 PM.
Old 11-27-2020, 05:12 PM
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Originally Posted by Clinker View Post
Did you get the handbook with the engine?
Originally Posted by 52wrench View Post
Why would dumping or spraying fogging oil in each hole and turning it over without the plugs be a big no no? Put some marine stabil in the tank, run engine, remove plugs, spray in some fogging oil, crank over, install plugs. Done. Do not run it dry.
Yea, I get the fogging oil. But is specifically says 1-tsp of engine oil per hole. That's about 2-squirts each hole from the oil can. I guess holding the starter button in for a few seconds should make it spit out any excess.
Old 11-27-2020, 05:29 PM
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I fourth do NOT run till stalls. I spray fogging oil in my new mercury spark plug holes, and then turn over without plugs to spread oil around. Excess will fly out. Come Spring you will think you have a 2 stroke for 5 seconds at first start up.
Old 11-27-2020, 05:39 PM
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Get the EFI fogging oil and mix with gas - then run engine with that mixture for 10-15 mins. Yamaha has some or you can make your own.
Old 11-28-2020, 11:33 AM
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They should make an outboard they does all that automatically?
Wait,,,, nevermind. They would go out and business.
Old 11-28-2020, 01:53 PM
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follow the manual
Old 11-28-2020, 04:41 PM
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Right no need to reinvent the wheel just follow the manual. For all these years I just fogged by spraying fogging oil down the Quadrajet but if I had an EFI engine I’d do exactly what they say to avoid any damage to sensors etc. And every year it fires right up after cranking the engine enough to refill the carb bowl.
Old 11-28-2020, 04:44 PM
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Originally Posted by Dacman View Post
I say treat the gas with a storage rate of stabil and add fresh non ethanol to tank to stir it up
Run it awhile to get it thru the entire fuel system and turn off the key.
You want to keep the fuel system full of the stabilized mix.
My vote is so not run it dry but do stabilize , always
this is what I do with all my motors, 2 stroke and 4 stroke, never had a fuel issue from storage

I also probably run everything at least a couple times a winter

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