Winterizing carb vs. MPI

[Bob on This Too]

I've winterized my normally aspirated (1999 SunDeck) 5.0L Merc for the past 6 years, I used the old "Marvel Mystery oil down the carb till it stalls" method of fogging.
This summer I traded up to a 2004 240 SunDeck with a 5.0 L MPI engine and I have a feeling that I am not going to get away with pouring the oil down it's throat.

Is there a different process or do I use the same process?

Thanks
Bob

 

[johnb]

It is definitely different. It is documented in the Mercruiser users manual. Two basic steps. Did it myself for the first time this year, 2006 220SD with 5.0L MPI.

1) treat gas tank w/ stabilizer and run engine for 10 or more minutes (good time to change oil).
2) mix up fogging mixture in small gas can. Recipe is in manual. Gas-Outboard Oil-Stabilizer. I used 1-gallon can. You only need a little. Disconnect fuel line from main tank. Position mix can and stick line into it. Start engine. Fogging mix will get pulled right out of can into fuel pump. Run engine for 10 minutes or so. Reconnect fuel line.

Done. I didn't like the sound of it, but it all ended up being pretty easy. Not painful at all.

From what I've read, DO NOT spray fogging oil directly into intake. You can screw up your injectors that way.

 

[wish2fish]

Bob,

Welcome! John is correct above but try the search function as there were some recent threads that covered off on this subject.

 

[Weave]

Some guys here have also had luck by removing the fuel water seperator and removing 1/4 to 1/2 of the fuel and filling with 2 stroke oil and putting the filter back on and running until you see smoke coming out of exhaust. Once finished remove old filter and replace with new (primed) filter.

 

[Bob on This Too]

I am a big fan of reading the manual, except I bought the boat used and don't have one. I guess this is as good an excuse as any to buy one!
Thanks for the input (this far!)
Bob

 

[widowmaker]

The oil in the fuel filter method was easier for me. And I didn't replace the filter in the spring either with no problems. Put some rags in the bilge to catch the gas when you unscrew the filter and run the blower to vent. I used an oil filter wrench to remove it. BTW Wal-mart sells quicksilver oil, lube and some filters now; save $$.

 

[Weave]

Someone mentioned using a ziplock baggie around the can filter and unscrewing it with the bag around. All drips end up in the baggie....works great for oil filters too.
Whatever works for ya