Racor R12S or R12T ??? - SailNet Community

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Old 05-08-2011
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Racor R12S or R12T ???

Hi All...

I have a Racor R12S filter in my diesel fuel system. The Engine is a 2 cyl Yanmar (I forget which model number). The Racor is installed between the tank and the engine and, as far as I know, there is no other filter in the system.

From reading product descriptions, I see that the R12S is a 2 micron filter, while the R12T is a 10 micron filter. This filter has a little plastic attatchment that catches water and allows it to be drained.

I am wondering, would it be better to use an R12T instead of an R12S given that this is the first (and I think only) filter in the fuel line?
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Old 05-08-2011
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There should be an engine mounted filter ... besides the Racor.

The typical Yanmar engine mounted filter is 15-17ÁM (rated). The proper Racor to precede this engine mounted 'guard' filter is a 10ÁM (R12T). If there is no engine mounted filter then use just the 10ÁM.
Tank ---> 10ÁM ----> (15-17ÁM 'guard' --->) engine.
;-)
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Old 05-08-2011
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2 micron is too small for the primary filter--and I'm fairly sure your Yanmar has a secondary. If your Yanmar is a 2GM20F, it is on the forward end of the engine on the heat exchanger. What I've heard is that having a 2 micron on the primary can make the lift pump work harder.
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Old 05-09-2011
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Thanks very much guys, I'll replace the filter tomorrow.
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