Racor Filter Micron Size Yanmar 440

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IndigoStar

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Joined
Jul 17, 2016
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What Racor Filter (900 Series) micron size are folks using for Yamar engines? 2u 10u 30u?
 
Use a 2 micron for the on-engine Yanmar filter and a 10 for the Racor.


Why not use a 2 on the Racor? Well you could but then it will plug more quickly and you have a 2 on the engine to catch the really fine stuff.


Why not use a 30 on the Racor- puts too much load on the on-engine filter so it will plug more quickly. Also it is more expensive and difficult to change.


10 and 2 is a compromise.


David
 
Last edited:
Yup, 10 or 30. Have not seen much difference in clog rate on those, but 2's seem to choke up real quick.
 
I've read that two 2 micron filters are tough on fuel pumps. I use 10/2 ratio.
 
I've read that two 2 micron filters are tough on fuel pumps. I use 10/2 ratio.

I'm not a Yanmar guy, but diesel fuel delivery is pretty generic, so I can offer this:
Fuel pumps are generally pretty tough items, and should never see any strain if your filtration system is up to snuff and regularly monitored/maintained.
I would get another racor to mount inline, so that your filtration is 30-10-2, and install a vacuum gauge with a drag indicator between the filters and the pump.
 

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