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Old 07-17-2014, 06:07 AM
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Draining DEF

I learned you can drain the DEF tank yesterday (seems most think you can't).

To drain the tank:
1. Tank is right behind the hitch
2. Remove lower skid plate via 6 10mm bolts.
3. Remove 3 star bit screws on bottom of pump.
4. Place oil pan under pump.
5. pull straight down on pump (DEF will start coming out as you pull)
6. Grab some beer because it will take 2-3 hours to drain a full tank
7. Once def stops dripping reinstall all parts.
8. Clear codes.
9. add new DEF
10. Enjoy no codes


there may be an easier way, but it worked for me
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Old 07-17-2014, 09:53 AM
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Re: Draining DEF

I wish I had known this before I sent mine to the dealer! I tried siphoning which is impossible.

Thanks!
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Old 07-17-2014, 10:04 AM
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Re: Draining DEF

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Originally Posted by ExcursionDiesel View Post
I wish I had known this before I sent mine to the dealer! I tried siphoning which is impossible.

Thanks!
There is a check valve at the bottom of the tube. So yes, impossible lol. I tried with a 6' piece of fuel hose, and it just stops at about 3' in. (top of tank I assume)

You could go as far as running power to the pump to drain it quicker, but I wasn't in a hurry.
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Old 07-17-2014, 12:39 PM
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Re: Draining DEF

If I ever have that tank pulled, I'm installing a drain valve in it. Whoever designed a tank to hold a perishable fluid and didn't include a drain is a freakin idiot.
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Old 07-17-2014, 12:42 PM
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Re: Draining DEF

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Originally Posted by ExcursionDiesel View Post
If I ever have that tank pulled, I'm installing a drain valve in it. Whoever designed a tank to hold a perishable fluid and didn't include a drain is a freakin idiot.
Once you get the lower skid plate bracket off there is plenty of access too install one. Would put in a fumoto valve and cut a hole in the plate as well. Good call, may be my next project.
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Old 07-18-2014, 09:55 AM
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Re: Draining DEF

These definitely were installed with a short sighted view (no drain for a perishable fluid and no protection for easy to damage injector and harness from a rock or splashing water).
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Old 07-18-2014, 09:55 PM
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Re: Draining DEF

I could make a drain and sell it if there was enough interest
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Old 07-18-2014, 10:11 PM
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Re: Draining DEF

I would be interested but I think I'd prefer an opening on the top or side of the tank to assure it is protected. A siphon hose could empty it from there with ease.

The issue I see with adding a port or drain is creating debris when cutting the hole. Any contamination could clog the injector.
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Old 07-19-2014, 07:34 AM
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Re: Draining DEF

Quote:
Originally Posted by ExcursionDiesel View Post
If I ever have that tank pulled, I'm installing a drain valve in it. Whoever designed a tank to hold a perishable fluid and didn't include a drain is a freakin idiot.
Agree. You'd also think that the manufacturers would tweak the injection algorithm so that more is used as it degrades rather than simply triggering a fault if the expected NOx reduction doesn't occur.
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