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Old 03-17-2015, 01:36 AM   #1
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Vacuum Gauge On Racors?

Who has installed an aftermarket vacuum gauge on their Racor fuel filters?

Thinking of installing a set.

Anyone have advice?
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Old 03-17-2015, 01:43 AM   #2
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We have Racor's own gauge on our filters but a good friend installed a set of automotive-style gauges on the pilothouse instrument console of his deFever many years ago. He T'd the hoses to the gauges off the fuel feed lines to the engines.
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Old 03-17-2015, 05:23 AM   #3
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I too have the built-in one. I wouldn't remote the gauge but would make sure it's in the view of a cam in the engine room if you need remote monitoring. Keep the connections that can leak air in to a minimum - air can kill your engine.
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Old 03-17-2015, 06:29 AM   #4
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A vacuum gauge does work , but a far better concept is a DP , differential pressure gauge .

It also measures restriction thru the filter, and displays it at the dash.

Murphy sells them
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Old 03-17-2015, 07:28 AM   #5
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Have a dash mounted racor gauge at the helm and at the seperator for both the engine and the fuel polishing system.

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Old 03-17-2015, 07:30 AM   #6
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I have 2 vac gages mounted on the Racor units. When I install my engine room cameras this spring the gages will be in the field of view.
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Old 03-17-2015, 09:28 AM   #7
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IMHO a better option to just a vacuum gauge.



http://sailorssolutions.com/ProductImages/VG01_1.jpg

I check my vacuum gauge(s) as part of my pre-start routine. I there are engine performance issue while we are underway I can quickly check to see if it is fuel related.
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Old 03-17-2015, 10:03 AM   #8
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Its nice , but the rubber holding the yellow release pin dissolves in time , and you add air to the fuel line.

Great engineering!
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Old 03-17-2015, 10:11 AM   #9
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Very useful devices, I couldn't imagine not having them on a cruising boat.

Here's a great source for all your fuel vacuum and pressure gauge (and associated plumbing) needs. Good advice over the phone too.

DragPointerLookDown

PRESSUREGAUGES
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Old 03-17-2015, 10:20 AM   #10
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At what vacuum reading would be an indicator that it's time to change fuel filters? Mine reads about 4" as of this past Sunday.
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Old 03-17-2015, 10:29 AM   #11
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I did the Racor tee handle replacement and the gage has white-yellow-red range settings . I usually change it when it's in the the yellow. I don't know if Racor still sells the gage. It works great and I do a check at start up and ever time I do a engine check when underway.
Gulf Comanche I would plan on changing it soon.
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Old 03-17-2015, 10:50 AM   #12
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For minimum chance of air leaks, t handles are good but there are cheaper alternatives to the t handle Parker ones.

I like the remote monitoring though, just yesterday a couple oil jugs pinched a fuel line and faltered my genset and caused an engine shutdown just as I was entering an anchorage.

A t handle with recording pointer probably would have told me it was a filter or fuel line restriction instead of a lift pump failure which I started to investigate when bleeding the fuel pump was difficult...but a quick glance at a remote would have told me instantly.
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Old 03-17-2015, 11:00 AM   #13
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If you are going to rely on these gauges in lieu of the t handles realize that -6" of pressure is equal to about 2.9psi which is also equal to the head pressure of diesel fuel if the surface level in your tank is 8' above the gauge. If you add one, add it between the primary outlet and the secondary inlet. Then the 6" of vacuum won't be masked by the head pressure of the diesel in your supply tank and you will get an accurate measure of filter restriction your lift pump is experiencing.


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Old 03-17-2015, 11:28 AM   #14
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be sure to get the recording gauges
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Old 03-17-2015, 01:27 PM   #15
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Quote:
Originally Posted by Gulf Comanche View Post
At what vacuum reading would be an indicator that it's time to change fuel filters? Mine reads about 4" as of this past Sunday.
For folks with Lehman 120s be aware that these engines pull so little fuel that it's likely a vacuum gauge--certainly the Racor gauge mounted on the filter itself-- will never show any reading at all under normal operation. So if the day comes when it does show a reading of any sort, that would be the time to change the filter element.

However, if one changes their filter elements on a regular schedule-- every oil change, once a year, etc-- the chances are an element will have been changed long before it reached the point of providing enough resistance to put an indication on the vacuum gauge.
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Old 03-18-2015, 07:27 AM   #16
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With a fresh filter go operate and note the needle position in the log.

Paint a drop on the position on the gauge , anything observed later above that is filter restriction .

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Old 03-18-2015, 08:49 AM   #17
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FF help educate me. How does air get into the diesel system if the rubber deteriorate on top of the vacuum gauge?




There is a bourdon tube inside the gauge that prevents contact between the median tested and ambient conditions.
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Old 03-18-2015, 09:47 AM   #18
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Bought a set from McMaster-Carr. Don't recall the price but way cheaper than the Racor units.




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Old 03-18-2015, 11:02 PM   #19
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Quote:
Originally Posted by Marin View Post
For folks with Lehman 120s be aware that these engines pull so little fuel that it's likely a vacuum gauge--certainly the Racor gauge mounted on the filter itself-- will never show any reading at all under normal operation. So if the day comes when it does show a reading of any sort, that would be the time to change the filter element.

However, if one changes their filter elements on a regular schedule-- every oil change, once a year, etc-- the chances are an element will have been changed long before it reached the point of providing enough resistance to put an indication on the vacuum gauge.
Bingo!

And that is why I feel your money is better spent on water probes/alarms.
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Old 03-19-2015, 01:19 AM   #20
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Mods-
Could you please change the word "Favor" to "Racor" in the title of this thread ?

Darn auto correct.
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