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Old 08-16-2015, 09:57 PM   #21
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Toss it overboard
Yeah, then light the surface of the ocean on fire! Great family fun
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Old 08-16-2015, 10:55 PM   #22
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I changed my racor after 1,000 hrs and it was spotless as well as the bowl.
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Old 08-16-2015, 11:31 PM   #23
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What would be great is a way to swith them to work in line so that you could use a 10 micron filter and then a 2 micron filter in the second unit.
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Old 08-17-2015, 05:02 AM   #24
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However, if you have bad fuel, you will slowly be clogging both filters which defeats the purpose of a back up.
Exactly.

Also, why change an unused filter?

Amen I change the old filter, I prime it, Tom the engine, make sure everyone is happy, then switch.

Don't over think the simple stuff
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Old 08-17-2015, 06:23 AM   #25
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However, if you have bad fuel, you will slowly be clogging both filters which defeats the purpose of a back up.
That's why there is a Racor vacuum guage at the helm, see the restriction before it shuts you down.

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Old 08-17-2015, 11:06 AM   #26
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Those gauges only really show vacuum at WOT and by then it could be too late. My electronic engines allow a display of engine load and whenever there are fuel restrictions be it the primary or the secondary it shows up there way before I've ever seen any movement on the vacuum gauges. This usually happens around the 200 hour mark and corresponds to about 2000 gallons on a series 500 racor. Never had pleated paper filters in diesel more than a year before they needed changing, but according to an injection pump rebuilder they do get soggy and do collapse creating numerous shop service opportunities. On our boat a clogged secondary caused an 8% increase in fuel use on one engine during a recent trip. It's human nature to try to stretch filter intervals but every time I've tried it I wish I didn't.



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Old 08-17-2015, 11:58 AM   #27
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Those gauges only really show vacuum at WOT and by then it could be too late.
That's a new one on me. Every one I've ever been associated with shows vacuum as soon as the engine goes on, and varies some with throttle level. That's why having the drag pointers is a nice feature.
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Old 08-17-2015, 12:50 PM   #28
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I changed my racor after 1,000 hrs and it was spotless as well as the bowl.
That's excessive... If I were you, I would be worried my tanks need cleaning. Unless you filter your fuel and you get zero moisture into your tanks, you might want to check that. Just in case.
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Old 08-17-2015, 01:03 PM   #29
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That's a new one on me. Every one I've ever been associated with shows vacuum as soon as the engine goes on, and varies some with throttle level. That's why having the drag pointers is a nice feature.
+1 With the 450 Cummins, I saw the vacuum gauge moving at 4 gph when the element started loading up on junk from 2 year old fuel. When it reached 2" of vacuum, I switched filters and changed the spent one that evening.

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Old 08-17-2015, 01:20 PM   #30
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Not sure what you mean. Clean filters and no sediment in bowl means clean fuel and tanks.
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Old 08-17-2015, 01:32 PM   #31
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How do you dispose of a used filter that is soaked with fuel? Also what do you do with the fuel that you drain from the bottom of the filter?
Many marinas, especially those with a mechanic or yard, will have designated containers for used oil, bad gas and a spot for contaminated rags and used filters
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Old 08-17-2015, 01:38 PM   #32
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We only change the racor filters annually or when the pressure gauge shows them in need of being replaced, not based on hours running.

If we hit the annual mark and both filters are the original ones, we change them both.
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Old 08-17-2015, 02:48 PM   #33
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This is the first I've heard of the filters breaking down over the course of a year. Our practice is to swap to the clean filter once a year and replace the one we ran on the previous year. I'm frugal, not cheap, so if it is true that the filters are breaking down during the 12 months they sit, then perhaps I should be changing both? Put 100-150 hours a year and have not had a problem.
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Old 08-17-2015, 02:56 PM   #34
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Carolena, the way I look at it it's very cheap preventive maintenance to replace them both.
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Old 08-17-2015, 03:11 PM   #35
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I change mine on condition. The water coating is interesting but it's the turbine that spins out any water in the fuel, if your Racors are sized properly. Waste of time and money changing them annually.
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Old 08-17-2015, 03:23 PM   #36
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5 years and 300 hours (under the previous owners)...The black is Asphaltine and I had a big Fleetgaurd upstream which caught most of the crap.. Still ran perfectly BTW....

(New filters all around under my stewardship!)

Personally, I would not run a small Racor as my primary filter...but if it's all ya got, change it annually.
My Big Fleetguard 27 micron upstream will take a ton of stuff before becoming an issue...The racor is downstream from that and ahead of the engine mounted filter. Overkill? Sure, why not. Filter clogging is the LAST thing I worry about.

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Old 08-17-2015, 03:58 PM   #37
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I change mine on condition. The water coating is interesting but it's the turbine that spins out any water in the fuel, if your Racors are sized properly. Waste of time and money changing them annually.
Here's some education for you on the water separation process: see page 7.

http://www.parker.com/literature/Rac...cts_-_7501.pdf
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Old 08-17-2015, 07:44 PM   #38
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Not sure what you mean. Clean filters and no sediment in bowl means clean fuel and tanks.

Maybe, but it might mean you have an inch or so of sediment in the bottom of your tanks too.
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Old 08-17-2015, 11:34 PM   #39
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On my former (very old boat) I dumped all the necessary anti-algae chemicals and treatments into my fuel tank, ran it locally so it was all stirred up, then had it vacuum cleaned out. All the gunk and sludge and muck and mud. Nasty stuff.

Then I only ran single filters, no duals at all. Those Grays never missed a beat.

So the conclusion of this anecdote is that it may be better to save a couple hundred dollars on the dual unit and instead put that into a properly placed drain at the bottom of your tanks.
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Old 08-18-2015, 06:42 AM   #40
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So the conclusion of this anecdote is that it may be better to save a couple hundred dollars on the dual unit and instead put that into a properly placed drain at the bottom of your tanks.
I am unaware of any of the boat manufacturers placing a bottom drain on their fuel tanks and have often wondered why. It doesn't seem like a big cost item. My suspicion is it takes 10-15 years to build up most of the crud and water can be handled by the Racor(s) most of the time so they just leave as an owner problem. Also the bottoms of some (many) fuel tanks are inaccessible.
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