DFCM draining...
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Junior User
Joined: May 2013
Posts: 50
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From: Heath, TX
DFCM draining...
Just checking in with the more experienced 6.7 owners here...
I set up a calendar reminder to drain the DFCM and saw a little bit of water in the bottom of the jar during this most recent service. Wondering if I should do this more often? I currently do this once a month. Since it's so simple it wouldn't be a big deal to do it more often, but not looking for busy work if it's not a big benefit.
Wondering how often folks do this service?
I set up a calendar reminder to drain the DFCM and saw a little bit of water in the bottom of the jar during this most recent service. Wondering if I should do this more often? I currently do this once a month. Since it's so simple it wouldn't be a big deal to do it more often, but not looking for busy work if it's not a big benefit.
Wondering how often folks do this service?
Fleet Mechanic
Joined: Jun 2009
Posts: 1,346
Likes: 4
From: Connecticut
I do mine once a month.Havent gotten or atleast havent seen any water in 18 months..How recent was this last drain? Myself I would do it again sooner then later after finding water.. But im a little neurotic like that.lol
Post Fiend
Joined: Mar 2013
Posts: 5,929
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From: EC Iowa
in my opinion except I haven't found any water yet.
Tim.
Senior User
Joined: Mar 2012
Posts: 116
Likes: 0
From: Plainfield,IL
For the guys that say they "have seen a little bit of water", what exactly does that look like???
When I drain mine I usually will have what I assume is small bubbles in the bottom of the jar( after I let the jar settle for a few hours)or possibly water...but I'm not sure.
Is there a way to determine if it is actually h2o???
Anybody have any pics??
When I drain mine I usually will have what I assume is small bubbles in the bottom of the jar( after I let the jar settle for a few hours)or possibly water...but I'm not sure.
Is there a way to determine if it is actually h2o???
Anybody have any pics??
Thread Starter
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Junior User
Joined: May 2013
Posts: 50
Likes: 0
From: Heath, TX
I'm assuming it was water as it looked distinct from the diesel as small bubbles on the bottom on the jar. It wasn't very much, just a few drops. I didn't let the jar sit, though, so maybe I should do that next time.
I'll try again in a few days to be sure ... I'm obsessive about maintenance so this will bug me. Of course I think my OCD in this case is justified considering the amount of money I have in this thing
thanks for the informative replies -- can't imagine owning this thing without a resource like FTE available!
I'll try again in a few days to be sure ... I'm obsessive about maintenance so this will bug me. Of course I think my OCD in this case is justified considering the amount of money I have in this thing
thanks for the informative replies -- can't imagine owning this thing without a resource like FTE available!
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Post Fiend
Joined: Mar 2013
Posts: 5,929
Likes: 287
From: EC Iowa
For the guys that say they "have seen a little bit of water", what exactly does that look like???
When I drain mine I usually will have what I assume is small bubbles in the bottom of the jar( after I let the jar settle for a few hours)or possibly water...but I'm not sure.
Is there a way to determine if it is actually h2o???
Anybody have any pics??
When I drain mine I usually will have what I assume is small bubbles in the bottom of the jar( after I let the jar settle for a few hours)or possibly water...but I'm not sure.
Is there a way to determine if it is actually h2o???
Anybody have any pics??
May help to put some light under container. But it should be easy to tell the difference.
Tim.
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Post Fiend
Joined: Mar 2013
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From: EC Iowa
Tim.
Cargo Master
Joined: Jul 2008
Posts: 2,580
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I drain mine just about every tank. The only exception to this is weather conditions and travel circumstances. On a long trip I have gone 3 tanks without draining, but the vast majority of the time it gets drained each and every tank. The amount I drain off I'd say is a bit less than a cup, maybe 3/4 cup or so.
Just for the record, I have never seen any moisture of note in my samples. I would be curious to get some tested to see whats really there, but as far as I know the fuel tests are highly specialized and expensive - unlike the oil tests that vendors such as Blackstone Laboratories provide.
Just for the record, I have never seen any moisture of note in my samples. I would be curious to get some tested to see whats really there, but as far as I know the fuel tests are highly specialized and expensive - unlike the oil tests that vendors such as Blackstone Laboratories provide.
Postmaster
Joined: Aug 2011
Posts: 4,637
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From: Roll Tide, Roll
The best method is after you drain say 8/10 o/z is put lid on jar and spin it like it makes a little tornado. Then let sit 2 hours. If you got water its very easy to see.. and for the ones who dont no exactly what it looks like get just drop a few drops of water in your sample jar. You will no what to look for next time.
Super Moderator
Joined: Aug 2008
Posts: 37,384
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From: Frederick, MD
I would follow your gut. I have sometimes drained daily or twice a day if on the road. As your pumping sometimes you can look at the fuel and get the idea it may not be as good as you like it.
If you get water then drain again in a few.
If you get water then drain again in a few.
Senior User
Joined: Nov 2013
Posts: 163
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From: Albany NY
For the guys that check for water more frequently than monthly...I'm assuming the reason is obvious (easy check to avoid a disaster) however isn't the WIF sensor located in the DFCM? If the sensor is working properly wouldn't it "sense" any small amount of water? Or does it take more to trip it? Of course if the sensor fails you'd find out the hard way. A redundant sensor would make sense.
I guess I'm wondering if the sensor is designed to tell you to drain the DFCM or is it to tell you "your in trouble". I never want to see my WIF light come on because then the PCM will always remember it. Imagine 30K miles later you have a HP pump fail and the dealer plugs in the diagnostics and says "ah ha!" you had a WIF sensor come on two years ago which means you in fact had water in the fuel which means you're warranty is denied
I guess I'm wondering if the sensor is designed to tell you to drain the DFCM or is it to tell you "your in trouble". I never want to see my WIF light come on because then the PCM will always remember it. Imagine 30K miles later you have a HP pump fail and the dealer plugs in the diagnostics and says "ah ha!" you had a WIF sensor come on two years ago which means you in fact had water in the fuel which means you're warranty is denied