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KC Desert

HELP! How does one drain the DEF tank? Need to empty it.

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So my son and I were doing little maintenance items like adding DEF and Stanadyne and he inadvertently put about 1oz of Stanadyne in the friggin DEF tank before he caught it. I looked underneath and see sensors plugged into what I am pretty sure is the DEF tank (I followed the tubing down to it from the filler) and one towards the front (FIRST pic) looks like you can unplug the sensor and put a large wrench on it and open it but anyone know for sure? 

 

 

Thanks. Sigh...

 

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Edited by KC Desert

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1 ounce of Stanadyne to 7 gallons of DEF is about 1 to 896 ratio.  I'm not sure, but such a small amount may have no effect.

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7 minutes ago, Thankful said:

1 ounce of Stanadyne to 7 gallons of DEF is about 1 to 896 ratio.  I'm not sure, but such a small amount may have no effect.

Thank you for that, I did not consider the ratio but makes sense. 

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I do not know how to drain it but I would not fire that engine up until someone who is an expert in this area has properly advised you on next steps. Even if it is such a small ratio.

 

 

Sent from my iPhone using Tapatalk

 

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I kept pushing gallons of DEF down the tube then siphoning from as deep as I could send the tube until it was nearly clear. So far its running fine. 

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Run it.  You probably will end up fixing the common DEF issues by having an additive in there, haha.

 

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On 2/9/2020 at 10:06 PM, MooseAK said:

Delete it and never have to worry about it again 

Interesting that you have made 3 posts to the forum. ( 2 of them back to back in this thread)

 

Every one says 'delete it'.

 

 

Edited by redwngr

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Is there a way to drain DEF from a Silverado HD?  I had 1.25 gallons in a half emptied 2.5 gallon jug and an unopened 2.5 gallon jug that I put in yesterday and the mileage seems to have suffered as a result (based on the truck's information feed).  Maybe the DEF turned bad? I was at 22% DEF level when I added it.  If I can't drain it, perhaps adding another 2.5 gallons of new DEF would help?

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So, between yesterday and today, you drove a long ways, enough to notice that your mpg has dropped?  Could it just be that you happened to be driving while the truck was going through a regen cycle?

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people....think about it...this stuff gets sprayed into the output of the truck...how in the world could it effect anything ..maybe a def quality check engine light but i cannot think of anything else..

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