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  #13  
Old 12-06-2014, 05:18 PM
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Re: Draining DEF

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Originally Posted by Olivia_2015 View Post
I thought that only problem with DEF was unprotected nozzles. Why DEF should be drained? Wouldn't any DEF issue be fixed in 2015 models or with tsbs?
Draining is necessary if it becomes contaminated or "old".

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  #14  
Old 12-06-2014, 05:21 PM
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Re: Draining DEF

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Originally Posted by ExcursionDiesel View Post
6k to 10k is all you should get from an 8 gallon tank. Usage runs 800 to 1200 miles per gallon depending on driving style.

I concur. I've been averaging 1100 miles/gallon of DEF.


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  #15  
Old 12-10-2014, 09:34 AM
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Re: Draining DEF

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Originally Posted by ExcursionDiesel View Post
Draining is necessary if it becomes contaminated or "old".
Can't yoh use oil change draining pumps?
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  #16  
Old 12-10-2014, 10:42 AM
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Re: Draining DEF

Quote:
Originally Posted by Olivia_2015 View Post
I thought that only problem with DEF was unprotected nozzles. Why DEF should be drained? Wouldn't any DEF issue be fixed in 2015 models or with tsbs?
DEF has a shelf life. The hotter it gets, the shorter the life span. Lots of sources can tell you the "lifespan" before the urea in it breaks down. If the urea breaks down and the concentration of it gets too low, the computer detects an insufficient amount of urea and will force you to resolve the problem.

One source for DEF lifespan: https://cda.extra.chrysler.com/icon/...es/2500110.pdf

If you live in a really hot climate and drive very little, DEF can go "bad" in your tank. That's why many people in hot climates who won't use up the DEF fast enough don't fill the tank "full" - they only put in a half-tank or whatever at a time of fresh DEF. Then if it does give an error they can "top up" with more fresh DEF to increase the urea concentration and make the computer/sensors happy.

BTW, DEF can be used as fertilizer if you ever have to dispose of it. It's just 32.5% urea + 67.5% water so basically a nitrogen fertilizer - just dilute down or water in well.
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  #17  
Old 12-10-2014, 10:52 AM
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Re: Draining DEF

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Originally Posted by Olivia_2015 View Post
Can't yoh use oil change draining pumps?
Depends on what you mean by that.

There are two ways to drain the DEF tank. One is drop the pump out (you can find those directions on a thread here the forum). The other way is the "Chrysler" way where you remove the fill hose at the tank and use a pump to siphon it out.

The DEF fill hose is designed in such a way you can't just put a long tube down the filler. You actually have to remove the hose from the tank (it's the tank at the very rear of the car) and then you can put a siphon in the tank opening.

But, you don't want to re-use any other siphon hose. If you get contaminants or oil in the tank, I wouldn't be surprised if it caused serious problems.
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  #18  
Old 12-10-2014, 11:01 AM
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Re: Draining DEF

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Originally Posted by dereed999 View Post
But, you don't want to re-use any other siphon hose. If you get contaminants or oil in the tank, I wouldn't be surprised if it caused serious problems.
Yes...in fact, if you don't take precautions to keep everything essentially sterile, you WILL contaminate the tank. I did a calculation and a tiny fraction of a milliliter of nearly any type of contaminant will cause the DEF to become ionized (electrically conductive) which will cause DEF to form chrystals and clog the pump and injector.

Bottom line: DO NOT attempt to put ANYTHING, including your fingers, into any opening in the tank unless it has been wiped clean with DEF or denatured alcohol and then dried. Period.
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Old 01-04-2015, 08:23 PM
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Re: Draining DEF

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Originally Posted by ExcursionDiesel View Post
6k to 10k is all you should get from an 8 gallon tank. Usage runs 800 to 1200 miles per gallon depending on driving style.
+1 I see ~6k-8k on a tank, running 70-80k
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Old 06-11-2016, 03:48 PM
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Re: Draining DEF

Referring back to the original post, how do you clear the message once the tank is drained and new, fresh DEF is put in? I'm still getting the "Incorrect DEF" message even though I was able to clear the check engine light. Also the DEF level indicator is still showing the level I had before draining it. I emptied about 6 gal out (about the amount I estimated I had in there) and only put 2.5 gal back in, but the indicator is showing that I'm at about 75%
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  #21  
Old 06-11-2016, 04:04 PM
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Re: Draining DEF

Oh wow didn't realize DEF can deteriorate in hot weather. I thought once inside the tank it's protected but good to know as I tend to keep things full at all times except for this which I will just fill a little at a time.


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Old 06-11-2016, 09:51 PM
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Re: Draining DEF

Quote:
Originally Posted by ExcursionDiesel View Post
Yes...in fact, if you don't take precautions to keep everything essentially sterile, you WILL contaminate the tank. I did a calculation and a tiny fraction of a milliliter of nearly any type of contaminant will cause the DEF to become ionized (electrically conductive) which will cause DEF to form chrystals and clog the pump and injector.

Bottom line: DO NOT attempt to put ANYTHING, including your fingers, into any opening in the tank unless it has been wiped clean with DEF or denatured alcohol and then dried. Period.
so I gather the idea of installing a drain into the tank would be seriously bad?

interesting, wasn't aware DEF was that sensitive
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  #23  
Old 06-13-2016, 05:28 AM
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Re: Draining DEF

Quote:
Originally Posted by dereed999 View Post
DEF has a shelf life. The hotter it gets, the shorter the life span. Lots of sources can tell you the "lifespan" before the urea in it breaks down. If the urea breaks down and the concentration of it gets too low, the computer detects an insufficient amount of urea and will force you to resolve the problem.

One source for DEF lifespan: https://cda.extra.chrysler.com/icon/...es/2500110.pdf

If you live in a really hot climate and drive very little, DEF can go "bad" in your tank. That's why many people in hot climates who won't use up the DEF fast enough don't fill the tank "full" - they only put in a half-tank or whatever at a time of fresh DEF. Then if it does give an error they can "top up" with more fresh DEF to increase the urea concentration and make the computer/sensors happy.

BTW, DEF can be used as fertilizer if you ever have to dispose of it. It's just 32.5% urea + 67.5% water so basically a nitrogen fertilizer - just dilute down or water in well.
The link is now broken. There are many pages on DEF deterioration but I'm not readily finding any from Jeep. Are there any?
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  #24  
Old 06-13-2016, 11:07 AM
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Re: Draining DEF

get the GDE tune and then when the weather is warm you can fill with distilled water. DONE! by the end of the summer, shes all cleaned...
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