Bestred1 - 4/30/2006 9:30 AM
Its just amazing to me that this type of maintenance isn't documented anywhere. Just like decarbonizing, everyone seems to have their own schedule for doing it.
I think the reason for this is that no one operates their boats the same. Someone operating a boat 300 hours a year is going to have a different maintenance schedule than someone operating their boat 50 hours per year. That is why you see some maintenance intervals based on operating hours and some on a calendar basis. Also, if you use crappy Wally World oil like I do you might want to decarbon more frequently than someone that uses great quality oil like Merc Premium Plus.
Here is one more filter change procedure. Install a vacuum gauge in the outlet port to your fuel filter and then change the filter when it gets dirty. Might take 50 hours and might take a thousand hours, it depends on the quality of the fuel. How will you know when the filter needs changing? When the filter is new the gauge will register zero or very little vacuum at all. As the filter progressively gets clogged with debris, the gauge will indicate an increasing vacuum. Once the gauge registers five or so inches of mercury you know that it is clogged to the point that it needs to be changed.
Whatever you do, it is a good idea to have the Racor transparent bowl installed and check it regularly for the presence of water. Drain the water each time you see some in the bowl. If you see a lot of water quite often you might want to determine how the water is getting into the tank, as this is not normal. As noted above, you don't want water getting to the engine.