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Old 06-07-2012, 11:25 PM   #21
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Gentlemen (and Ladies), somewhat off topic;
a little while ago there was a "lively discussion" regarding optimum fuel filter micron size. I can't find it in the archives or looking back through the threads. Does anyone recall what the title of the thread was? KJ
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Old 06-08-2012, 06:39 AM   #22
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Quote:
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^ This looks like an appology to me ... kinda... I thought he was presuming as well
Well lookie here...now who's presuming...

KJ...this one?

Is 10 micron enough?
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Old 06-08-2012, 10:53 AM   #23
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Yes, that's it. Thank you. KJ
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Old 06-08-2012, 11:06 AM   #24
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Well lookie here...now who's presuming...

KJ...this one?

Is 10 micron enough?
When polishing I use 2, and 10 for the engines.
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Old 06-08-2012, 02:31 PM   #25
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When polishing I use 2, and 10 for the engines.
Wow...that's just the opposite of my philosophy...
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Old 06-08-2012, 02:39 PM   #26
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Wow...that's just the opposite of my philosophy...
Same here... I polish at 30 then filter 10 to 2.
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Old 06-08-2012, 03:58 PM   #27
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Same here... I polish at 30 then filter 10 to 2.

Why would you polish with 30 and leave the big stuff for the engine filters?

The Racor used to polish is 2, the Racor to the engine is 10 and the 671 engine filter is 2 or 3. The double Rocors are the 1000, 180 gph, and the fuel is clean so I guess I could go all 3? Never thought about it?
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Old 06-08-2012, 09:40 PM   #28
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Quote:
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Why would you polish with 30 and leave the big stuff for the engine filters?

The Racor used to polish is 2, the Racor to the engine is 10 and the 671 engine filter is 2 or 3. The double Rocors are the 1000, 180 gph, and the fuel is clean so I guess I could go all 3? Never thought about it?
Because there are filters to trap the stuff before it gets to the engine...just not tons of stuff that the 10-30 are taking out in the polishing...instead of the other way around...

Neither is right or wrong...just a different appraoch and the amount of filters used maybe...
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Old 06-13-2012, 09:35 AM   #29
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In the current issue of PassageMaker, Steve D'Antonio has an article dealing with trying to create a fuel polishing system as a DIY project.

One of the points he made is that the return line should be at the bottom of the tank, not the top where a normal excess fuel return is placed. It should also be at the opposite end of the tank from the fuel pickup to encourage fuel movement so you don't just polish the same fuel over and over again.

He makes other points so for anyone considering trying to design a fuel polishing system for a boat should probably read the entire article.
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Old 06-13-2012, 11:35 AM   #30
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If you search the archives using "micron" for the keyword it should unearth all sorts of posts and discussions.

On the advice of our diesel shop as well as friends in the marine diesel and generator manufacturing industry we have run 2 micron filters only for the last 14 years. Primary and secondary. Our (and their) philosophy is to catch everything as far from the engine's injection pump and injectors as possible.

Our boat had new tanks when we bought it, all tanks gravity feed from the lowest point in their bottoms (no pickup tubes in the system), and our fuel supplier has a high turnover of product so the fuel is very clean. So our filters don't have much-- if anything-- to do.

Now if a boat has dirty tanks or if the fuel supply is questionable it might make sense to run a progressive filter setup, say 10 micron closer to the tank and 2 micron closer to the engine. While crud is crud and it will collect in the filter elements no matter what, having a 10/2 setup might at least extend the time a bit before the elements need to be changed since everything's not ending up in the first filter down from the tank.

But I think I'd still rather be catching everything as far from the engine as possible even if it meant changing the element in the first filter in the line more often.
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