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Vacuum gauges are great for diagnosing a problem. I prefer having them mounted near the engine gauges. Scenario is like this. Engine starts to run crappy, look at vacuum gauge. If vacuum is higher than normal you have a plugged filter, if not then something else. i.e. over heating. I have a dual Racor setup with a gauge between them in the new(er) boat.
In my experience filters don't get dirty over time. They get plugged all at once from some crap that comes loose in the tank. I have run for years without having to change any filters. Then I eventually just change them because it seems like a good idea.
Gene
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Currently in Long Beach, CA
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