diesel fuel filters

Zonker

Super Anarchist
9,139
5,051
Canada
On my boat I put the little electric fuel priming pump toggle switch right beside the pump. Perfect for filling the filter just enough.

And the pump was a backup if the mechanical fuel pump ever stopped working

 

Rain Man

Super Anarchist
7,022
1,942
Wet coast.
One more convenient thing to put in your fuel filtration system is a vacuum detector.  If the filter gets dirty the fuel pump will create a partial vacuum trying to suck the fuel through it.  You can see at a glance that your filters need changing.

 

tane

Anarchist
772
180
I regard a Racor as an essential piece of gear - I had canister filters on one boat and hated them - you can't tell what's going on.

My current setup has the Racor, the water strainer and the seacocks all in one place so everything gets checked every time I open or close the seacocks - basically twice every time the boat goes out - I really like it.

View attachment 483748
Racor! - forget everything else!

 

woodpecker

Member
496
81
I know the replacement elements come in 10, 20 and 30 Micron for the Racor.  What are the 3 scenarios for using the correct one? 

RAC2010TM__08031.1609975543.gif

 
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longy

Overlord of Anarchy
6,302
896
San Diego
Depends on how sensitive your particular engine is to particle size, and how easy/hard it is to change the engine mounted filter. On Yanmars, with the Racor easily accessable, I like to run the primary at 5 microns. This is over filtered, the engine mounted filter is 10 microns. But filters, as they become plugged, tend to let more particles thru. So I rely on the engine filter as back up insurance for anything that might get thru the primary. I will change the Racor 3 times before changing the engine filter as long as no unusual clogging has occured.

 

Rain Man

Super Anarchist
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Wet coast.
In our 2-stage system we are running a 30 micron primary and 2 micron secondary.  There is, of course, much debate about the correct staging in such a system.  5 micron for a single filter sounds reasonable but you may need to carry spares.

The 2 micron filter is physically much smaller than the 30 micron filter.  If it was the only filter it would quickly plug up.

When we changed ours out the 30 was quite ugly, and there was water in the separator, while the 2 looked ok.  At the time our vacuum sensor showed "replace" and I suspect it was the 30 causing this.  We have no idea how long the filters had been in the boat as the PO didn't keep a log.

 
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Zonker

Super Anarchist
9,139
5,051
Canada
10.

2 clogs way too easy if you have something in the fuel. "20" isn't a Racor size

30 just means the horrible Yanmar 10 element clogs up...

You don't need to use the special "Racor" vacuum gauge. Any pressure/vac in the same range will work.

There are now fake Racors on ebay. Not a place to save $$

image.png

https://www.amazon.ca/Filter-Separator-Diesel-Turbine-Superior/dp/B09BNLTJQT/ref=pd_day0_2/146-5201303-4103548?pd_rd_w=jFxno&pf_rd_p=a0f07c06-3bfe-427e-9527-5be8cea27b66&pf_rd_r=TA8FVX8JNVM9JRE7BRNB&pd_rd_r=8aa7364f-7479-4b17-87d2-bfceb6a37430&pd_rd_wg=IC80z&pd_rd_i=B09BNLTJQT&th=1

 
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slug zitski

Super Anarchist
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worldwide
I know the replacement elements come in 10, 20 and 30 Micron for the Racor.  What are the 3 scenarios for using the correct one? 

View attachment 484237
Don’t know your filter 

be aware that some years ago the filter and element were redesigned

a rubber spacer is needed to make new element match with old body 

many times the spacer comes with the new element 

double check your installation 

https://www.parker.com/parkerimages/Racor/7688 (Rubber Spacer TB).pdf

 

weightless

Super Anarchist
5,607
581
How much, if any, does the fuel flow of the engine play into the filter choices?

The folks who supplied our 2gm20 engines recommended the 225 with the r26s 2 micron canisters. They were problem free for thousands of engine hours with whatever the local fuel was and, now, suddenly, not so much. They are small engines and don't cycle a lot of fuel. I suppose the filter area is relatively large so would take more time to foul than on a bigger engine? Is there a minimum flow for the centrifugal water separators on the classic racors? 

 

slug zitski

Super Anarchist
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worldwide
How much, if any, does the fuel flow of the engine play into the filter choices?

The folks who supplied our 2gm20 engines recommended the 225 with the r26s 2 micron canisters. They were problem free for thousands of engine hours with whatever the local fuel was and, now, suddenly, not so much. They are small engines and don't cycle a lot of fuel. I suppose the filter area is relatively large so would take more time to foul than on a bigger engine? Is there a minimum flow for the centrifugal water separators on the classic racors? 
Modern diesel fuel …low sulfur, ecological reasons …fouls very fast 

typically you have two filters…the racor style pre filter and the main filter mounted on your engine 

The racor pre filter need not be so fine..10 or 20 micron is ok 

the main filter is normally 2 micron 

 
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Zonker

Super Anarchist
9,139
5,051
Canada
Is there a minimum flow for the centrifugal water separators on the classic racors? 
Yes. And little engines don't flow enough to matter. But the 500 shines in a few ways:

- easy to disassemble to clean
- replacement elements are about 1/2 the cost of the spin on types so over the lifetime of the filter if you keep the boat that long it may be cheaper
- the bowl still collects lots of water and will hold a large amount of water - if you buy fuel in rural North Carolina. That may be specific to me however.
- I think filter elements are quite a bit bigger than the smaller spin on types so won't foul as fast

 

SloopJonB

Super Anarchist
66,041
11,003
Great Wet North
One of the reasons I like Racor's is because they are easily rebuildable.

You can go from this;

Racor 1.JPG

To this;

Racor After.JPG

In a couple of hours for the cost of a rattle can of paint and a new 2010 filter.

 
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steele

Super Anarchist
1,682
204
Land of the locks
Although I understand the benefit of your two stage system, if one filter clogs all fuel stops. One of the benefits of a two filter system is locking out the bad filter to allow you to change it out while fuel moves throught the second. It may be hard to tell from the photo, but it does not look too difficult to add another hose and valve to allow the engine to run off one filter while you service the other.

 

slug zitski

Super Anarchist
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worldwide
Although I understand the benefit of your two stage system, if one filter clogs all fuel stops. One of the benefits of a two filter system is locking out the bad filter to allow you to change it out while fuel moves throught the second. It may be hard to tell from the photo, but it does not look too difficult to add another hose and valve to allow the engine to run off one filter while you service the other.
Two racors then two engine filters is the common setup

easy to shift from filter A to B while the engine is running 

2F7E9FA3-6491-48F7-B28E-C09408A3E499.png

 
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