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Old 16-03-2010, 13:09   #16
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For information about nominal and absolute micron ratings, see the Technical Paper

And what the experts say about 2-micron filtres

You could also benefit from reviewing
Fuel Filter Micron Size

The flow rate of a filter is the filters ability to pass a volume of fluid in a given time. Flow rate is affected by the amount of media and the restriction of that media. Generally, a filter that has high efficiency at removing small particles is going to be more restrictive to flow than a filter of the same size with same amount of media that has a lower efficiency at removing small particles.

To increase the flow-rate without sacrificing filter performance, a filter with more media surface area (bigger) may be used. While the media has the same restriction per sq: in., the larger surface area of the media will provide a higher flow rate. An increase in flow-rate can also be accommodated by adding another filter in parallel. Other media types are also available that may provide increased flow without sacrificing filtration performance.

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Old 16-03-2010, 13:31   #17
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Be sure the pump location is compatible with the type of filters. There are Racor push filters where the pump is before the filter and there are Racor suction filters where the pump must be after the filters.

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Old 16-03-2010, 14:18   #18
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Matrix - repeat after me - it works works now....

What you want to do is put a 3 way valve instead of a T connector in the supply line. This will keep the fuel going where you want (and no air coming from somewhere else - a bigger potential problem). Obviously you won't be able to polish and run your engine at the same time.

If you then find the pump isn't up to your polishing needs, then add another pump on the other side of the polishing Racor (suction). I'd recommend a Walbro FRB-13. Pumps about 50 gallons an hour. About $120.

I'd put a 30 micron on the engine primary since Yanmar says so and a 2 micron on the polisher. The quicker the polisher filter clogs the quicker it's gotten the crap out of the fuel. (This isn't quite true. A multistage filter system might save you a little money in filters over the very long term - but you must have something else to worry about )

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Old 16-03-2010, 14:41   #19
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Thanks! I got it ... manta repeated!

I am going to follow these guidelines and post a jpeg of my proposed system. Thanks for all the input from everyone.
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Old 16-03-2010, 16:49   #20
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Remember, before all else - The fuel in the tank/s, the fuel before one puts it into the tank/s. Filter it as you are filling the tank. Treat the tank's fuel with a biocide if the fuel is going to stand for long periods.
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Old 16-03-2010, 18:13   #21
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Whether you put the aux electric fuel pump between the tank and the filter - or - after the filter is dependent upon the make/model of the fuel filter. Some Racors and others are rated for either suction or positive pressure. Others are strictly suction units which require the aux electric pump between the filter and the engine.
- - The most practical filter system is two parallel filters with valves to isolate one filter or the other from the fuel flow system. That way when one filter clogs you can select the other fuel filter and continue operation while you change the clogged fuel filter.
- - Depending upon the engine sometimes the process of changing the "final" fuel filter mounted on the engine is very difficult so having your auxillary (fuel filter(s) before the engine) loaded with the same micron filter as the "final" filter will save the hassle of changing the engine mounted filter for a considerable length of time.
- - Whether you have dual filters in series is open for discussion as having a 10 mic first filter then a 2 mic secondary filter (matches the engine mounted filter) probably does not do much good whereas having a "switch-over" parallel system facilitates being able to bring on line a fresh clean filter without have to stop the engine and change filters while underway in huge seas and winds or entering a complicated harbor at night.
- - You can purchase dual "switch-over" parallel filter systems already assembled for a large amount of money or just go down to the plumbing store and build your own "switch-over" dual parallel system with some 3-way valves and tee's.

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