40 Mercury Smoking

[CajunChristian]

Originally Posted by Marshgoat

Thanks for the advice guys. In your opinion what is the biggest danger, the pump itself failing or an oil line breaking? I've researched a little and it appears some people have had Mercury oil pumps fail due to a plastic gear or bushing in the pump coming apart. Not sure if a 99 model would have plastic or not???. I guess you can tell I would prefer to keep the injection system but I also don't want to ruin a powerhead. Boat has a permanent fuel tank built as a step up to the front deck, I switch back and forth to a surface drive a couple times in a year so premixing fuel will be a little pain in the @#% every time I switch back to the Prodrive.

I have never seen a 40/50/60 Merc oil pump fail. It's usually a pinhole in one of the oil lines that gets you. The larger Mercs have a nylon drive gear on their pumps, the 40/50/60 has a metal drive gear.
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