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DEF usage ?


This is a discussion on DEF usage ? within the 6.7 Common Rail forums, part of the Dodge Ram Cummins Diesel Forum category!
First week with new 2014 3500 Dually Laramie, Cummins 6.7 ltr. Previously heard stories about some users getting up to ...


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Old 05-20-2014, 07:41 AM   #1 (permalink)
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Default DEF usage ?
First week with new 2014 3500 Dually Laramie, Cummins 6.7 ltr.
Previously heard stories about some users getting up to 10K miles on a tank of DEF. My truck had 250 miles not towing, and 520 miles towing a 14K camper and used nearly the entire tank of DEF. Interested in other Cummins w/ DEF users experience.


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Old 05-20-2014, 07:55 AM   #2 (permalink)
 
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I don't own a Cummins, but I do know that the guys that I work with have a few and a bunch of Fords that use the DEF. They all tell me it depends on how much you tow and idle etc. I wonder if it uses more at first than after it breaks in? I never have heard from them about that, sorry.
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Old 05-20-2014, 08:18 AM   #3 (permalink)
 
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Define DEF.


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Old 05-20-2014, 09:00 AM   #4 (permalink)
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Originally Posted by blacklabbob View Post
First week with new 2014 3500 Dually Laramie, Cummins 6.7 ltr.
Previously heard stories about some users getting up to 10K miles on a tank of DEF. My truck had 250 miles not towing, and 520 miles towing a 14K camper and used nearly the entire tank of DEF. Interested in other Cummins w/ DEF users experience.
That is way more than normal usage from all I have read. I think you should be getting at least 5K from a full tank of DEF. At the DEF usage you are talking about, you would have to refill the DEF tank at every fuel stop. Are you sure the tank wasn't nearly empty to start with?
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Old 05-20-2014, 09:27 AM   #5 (permalink)
 
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Originally Posted by UneasyJmitchell View Post
Define DEF.
Diesel Exhaust Fluid (horse pee)
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Old 05-20-2014, 09:35 AM   #6 (permalink)
 
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^Thanks


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Old 05-20-2014, 09:53 AM   #7 (permalink)
 
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Old 05-21-2014, 02:39 AM   #8 (permalink)
 
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I burned 3/4 tank of def last summer in 2600 miles. Most of it consumed on three trips pulling my TH, approx 6K lbs. Went an additional 3500 miles after refilling, and burned 1/3 tank not pulling. So I could see 10k between refills, but she sure the hell aint gonna do it pulling 14k.
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Old 05-21-2014, 06:08 AM   #9 (permalink)
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Also remember the dealer delivers these trucks without toping off, sad to say but you buy a $40K-70K truck and they won't fill it. Their have been a few articles as well on the way the DEF gauge works due to the fact DEF freezes its not a float style sending unit. It is a computer guess for the first 1/2 then some sort of light/beam (laser beam ) turns on and detects the fluid level from 1/2 to empty. So the only way to really know is top it full yourself then track it. Many have reported it being on full way too long then the bottom falls out.


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Old 05-21-2014, 07:33 AM   #10 (permalink)
 
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Originally Posted by RyeThomas View Post
Also remember the dealer delivers these trucks without toping off, sad to say but you buy a $40K-70K truck and they won't fill it. Their have been a few articles as well on the way the DEF gauge works due to the fact DEF freezes its not a float style sending unit. It is a computer guess for the first 1/2 then some sort of light/beam (laser beam ) turns on and detects the fluid level from 1/2 to empty. So the only way to really know is top it full yourself then track it. Many have reported it being on full way too long then the bottom falls out.
Sounds like a great system....

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