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Old 05-08-2017, 11:26 AM   #1
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Racor Filter Replacement

When you change a racor filter for a Ford Lehman 120 is it necessary to bleed the system after you replace the filter?
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Old 05-08-2017, 11:45 AM   #2
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If you make sure that the body of the Racor is full of diesel after you replace the filter, you shouldn't have to bleed. I have a 120 Lehman and don't have a problem.

The only time I bleed the system is after I replace the on-engine filters.

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Old 05-08-2017, 12:14 PM   #3
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Thanks. I used to be able to pay someone to do it when I had other work done. No mas...
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Old 05-08-2017, 12:37 PM   #4
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Islanddreamer is correct. Be sure to turn off fuel to tank line so fuel doesn't drain back into Racor.
Also, bleeding the FL 120 is dead simple and quick, one bolt, a few strokes on the fuel pump and you are good to go.
It is good to practice this at the dock so you know how if you need to do it underway.
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Old 05-08-2017, 03:29 PM   #5
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Quote:
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Islanddreamer is correct. Be sure to turn off fuel to tank line so fuel doesn't drain back into Racor.
Arch
I have never shut off the fuel, ,never had a problem with drain-back.
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Old 05-08-2017, 04:35 PM   #6
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I have never shut off the fuel, ,never had a problem with drain-back.
I would imagine that would depend on the relative heights of the fuel tank and filter.
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Old 05-08-2017, 04:47 PM   #7
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I have never shut off the fuel, ,never had a problem with drain-back.
Probably just the way mine is set up. Has happened to me so I've gotten into the habit of isolating the filter I'm working on.

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Old 05-08-2017, 05:08 PM   #8
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I would imagine that would depend on the relative heights of the fuel tank and filter.
Yes. If I don't shut off the fuel valve the filter will overflow into the bilge. However, once I'm finished replacing the element I can let gravity re-fill it. I have CAV on engine filters as well and I added the ABC CAV filter adapter so it can use screw on filters. Worth every penny.
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Old 05-08-2017, 07:38 PM   #9
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Yes. If I don't shut off the fuel valve the filter will overflow into the bilge. However, once I'm finished replacing the element I can let gravity re-fill it. I have CAV on engine filters as well and I added the ABC CAV filter adapter so it can use screw on filters. Worth every penny.
I cleaned out my Racors a couple weeks ago. It was pretty surprising how much crud I found hiding at the bottom of the bowl. Impossible to see until I took the metal heat shield off and dissembled the bowl. Anyway, I found that if I transferred fuel to one tank so it was almost full, and was patient enough, gravity would fill up the Racors after the new filters were put in. In the past, I didn't think this worked that well for me, but with a full tank and enough patience, it worked just great.
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Old 05-09-2017, 12:01 AM   #10
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Never shut the fuel off here either. Just made certain there was plenty of diesel in the Racor before I closed it up. Level should be at the top, and a little coming from around the brass handle as you secure it.
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Old 05-09-2017, 05:56 AM   #11
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Never shut the fuel off here either. Just made certain there was plenty of diesel in the Racor before I closed it up. Level should be at the top, and a little coming from around the brass handle as you secure it.
There is no need to refill them that high. Within a 1/2" to 1/4" from the top is fine.
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Old 05-09-2017, 09:36 PM   #12
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Racor Filter Replacement

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There is no need to refill them that high. Within a 1/2" to 1/4" from the top is fine.


That is true and I have left a 1/2" air gap a lot in the past. I am happier when it is filled to the brim however. I'm not sure it makes a difference but it makes me feel better.

Here is a quote that is from an article that I read a few months ago. I found it helpful to me with my limited understanding of fuel filtration.

Quote:
Assuming that your system is airtight and that aeration of the fuel is not a problem, then changing the filter remains the only way to introduce air. Some would have you believe that unless you fill the filter to the absolute top, you risk drawing air into your engine, and that is not true. Remember that a tube inside the filter creates the suction that pulls fuel through the element. As long as the fuel level remains above this pick up point, no air will get into the engine.

On a 900 series filter, that spot is about 4 inches below the lid–even if you only have fuel within 2 inches of the top, air will not be drawn in. In boatyards we often replace elements that show contamination from the bottom to within 2 to 3 inches of the top, and which look unused above that mark. This scenario typically arises when the last person who replaced the filter element failed to add fuel to the top. No additional air entered, and the upper portion of the filter remained unused. Cover the replacement filter with fuel, but you need not fill it to the brim. On smaller filters, however, the margin for error is less: On the 500 series, the pick up point is only about one inch below the top of the filter.
In the past on may sailboat, it was next to impossible to fill up the Racor filter. When changing it, I would see a good 1/2" of unused filter at the top. I figure is the fuel fills the canister, I am using all of the cartridge.
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Old 05-09-2017, 10:12 PM   #13
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BTW, I dug up an older thread that I thought was helpful, particularly this post by Howard.

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Given my curious nature, today I called Parker Filtration, the mfg of Racor. They said, on a dual setup, run one filter until it clogs or for a year, then switch to the second filter and change out the used one. I specifically asked them if a new filter sitting in diesel fuel for a year is compromised in any way and they said absolutely not. Then I asked about the water blocking properties of the filter and they assured me that it remains intact even though it is sitting in fuel for up to 2-years.



Howard

On my duals this is what I now do. Granted I have only owned my boat for a year and I just now cleaned out both filters, disassembling the bowl etc... When I did that, I had one spare filter so I re-used the filter that has been sitting idle for the past year and replaced the one that I have used. I now have each labeled with the date they were replaced. I am now using the 1 year old filter. Next year, I will replace it and start to use the filter that I just replaced. In this way, I will replace one filter per year, saving a tiny bit of cash and a few minutes.
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