Water Separator Drain--How Often? - Dodge Cummins Diesel Forum
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post #1 of 13 (permalink) Old 02-16-2009, 11:24 AM Thread Starter
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Water Separator Drain--How Often?

How often is it required to drain the water separator part of these 6.7 trucks?

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post #2 of 13 (permalink) Old 02-16-2009, 11:26 AM
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I usually just do it when I'm under there for an oil change. Doesn't take much time once your under. Sometimes only a few drops, sometimes a bit more.

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post #3 of 13 (permalink) Old 02-16-2009, 11:44 AM
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How often is it required to drain the water separator part of these 6.7 trucks?
it would depend on how confident you are on the fuel you buy. i drain about 5,000 mi. intervals only because ive checked regularly and have never found any signs of water. i buy all my fuel at local truck stop.

i add an extension hose and drain into a clear clean bottle to visually inspect whats been drained. i only drain after trucks been sitting overnight so everything settles

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post #4 of 13 (permalink) Old 02-16-2009, 11:47 AM
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How often is it required to drain the water separator part of these 6.7 trucks?
I've owned a diesel for many years and have yet to find any significant amount of water in the filter/separator. Just in case, I drain mine at each oil change and change the filter out at each second oil change.

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post #5 of 13 (permalink) Old 02-16-2009, 01:55 PM Thread Starter
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I haven't looked at the part yet, but I'm assuming there is a valve there. Do I open the valve and just see what comes out or do I have to put the truck in the "on" position to get the fuel pump on? Thanks.
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post #6 of 13 (permalink) Old 02-16-2009, 02:14 PM
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I haven't looked at the part yet, but I'm assuming there is a valve there. Do I open the valve and just see what comes out or do I have to put the truck in the "on" position to get the fuel pump on? Thanks.
Before you do anything, buy about 4' of 3/8" ID clear tubing. This is to replace OEM tube and cut to desired length to reach your container.

To drain, I go in over driver's side front tire and loosen the bottom of the filter a couple turns or so. Mine doesn't really drop anything out at this point, so I briefly turn the key to on (no start). This spits enough fuel out IMO to get rid of any water.

I got some watered down fuel one time at a station in Wyoming. Took several filter changes to get rid of the water in fuel light.

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post #7 of 13 (permalink) Old 02-16-2009, 04:12 PM
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The only truck I know of that ever had much water in there was my ma's '93 after the local body shop replaced the box and pinched/cut the fuel filler hose. The tire would throw water on it and got a fair amount of dirt and water in the tank over several months. The tractor tends to collect water too, but I doubt it will burn more than 20 gallons all winter. Unless you leave it outside and take two months to run a tank of fuel through, or get a bad tank, you shouldn't have to mess with it.

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post #8 of 13 (permalink) Old 02-16-2009, 07:26 PM
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I've found water (or some other sort of non diesel electrically conductive liquid) in my aftermarket separator, not much of it but something more than I would want going through the injection system.

I have yet to see any water separation efficiency numbers on the stock 6.7L filter so I really don't trust it for anything other than a secondary unit.

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post #9 of 13 (permalink) Old 02-16-2009, 07:31 PM
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Slag - Are you running those Cat/Fleetguard filters in-line with the stock filter?

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post #10 of 13 (permalink) Old 04-03-2009, 03:44 PM
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Is the water sep the same thing as the fuel filter?

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post #11 of 13 (permalink) Old 04-03-2009, 04:21 PM
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i just open the valve on mine with the truck running, and it will poor some diesel out and then i close it back after about 3 seconds, i know i am loosing some fuel, but it really isnt that much, and this way i know i am flushing it out.

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post #12 of 13 (permalink) Old 04-03-2009, 04:48 PM
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I generally allow the Blue Bus to mark its territory about every 2nd fillup.

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