winterizing 2004 8.1 mpi s procedure ??

[Jaay757]

image.jpg]I just purchased my 340 this year with the 8.1's. I also used the mixture recommended in the mercruiser manual. I had a hydraulic hose made up with fittings to accept the 3/8 portable tank fuel line and the other end threads into the cool fuel module. The gold colored fitting on the end is removed to plug the sea ray gas line to reduce any leaking fuel for safety. The silver colored fitting attaches where the fuel line would attach. I removed the the fitting at the fuel line. I also ran the motors with the mixture for about 15 mins as the manual stated while I warmed the engines for the oil change and winterization to run the antifreeze through. Each engine took approx 8 gallons before exiting the exhaust with the antifreeze. I also drained the mufflers after running the antifreeze through. I will try to attach a pict.

[my3sons]

I was wondering about preparing the fuel system for extended storage and disconnecting the harness connections from fuel pump and fuel boost pump. Does anyone have more detailed info like photos of these connections so it's clearer on what to do. The directions are kinda vague. Thanks!

Yes they are, I actually cheat and do not unhook the fuel pumps. Those raw water pumps will pump enough pink through them to winterize in about a minute, which in my opinion is not enough time to clear the filter of the mix. If you want to do by the book, the harness plugs are at each pump. Don't know how the motor would even run with no fuel pressure.

[my3sons]

my3sons
Nice manual. Where did you get it. I have printed version for my motors but an electronic copy would be nice.

I don't know where I downloaded my copy from, it was 4 years ago, but a quick search on the net brought up this one so I could help out skylark. Try googling up merc 7.4 service manual? good luck

[my3sons]

Skylark, Don't get confused about some of these posts from guys with later model engines with the cool fuel III, It's a different system than ours. If you want to use the auxilary tank method, a good place to plumb it in is where the in-line filter is in the fuel line between the tank and the boost pump/water sep filter, you should be changing the in-line filt anyway.

[Havana Shamrock]

I just realzed the year of his boat, they switched to gen III in 05' I believe. Sorry for the confusion

[my3sons]

Joe, no worries