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Old 04-14-2019, 08:10 PM   #1
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2018 DS K2 DEF leak

Hi Iím traveling and noticed after filling my DEF tank from the remote fill on the drivers side that it appears to have a leak in the sending unit area of the DEF tank. After the first day I cleaned it all up and drove, the second picture shows the mess on second day, my Jeep also had residue.
I also noticed that engine coolant runs through the sending unit.
Anyone with any information about a leak they have dealt with would be much appreciated.
Thank you Stuart W
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Old 04-14-2019, 08:11 PM   #2
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2nd day pic
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Old 04-14-2019, 08:53 PM   #3
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Just a guess, but the coolant may be used to deal with freezing.

The sending unit appears to twist into its seated position. I would loosen the screw and remove the ring to visibly inspect the gasket and seating of the sending unit.
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Old 04-14-2019, 09:09 PM   #4
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Quote:
Originally Posted by redbaron73 View Post
Just a guess, but the coolant may be used to deal with freezing.

The sending unit appears to twist into its seated position. I would loosen the screw and remove the ring to visibly inspect the gasket and seating of the sending unit.


The thing thatís throwing me is in both pictures it looks like it sprayed out
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Old 04-14-2019, 11:02 PM   #5
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Freighliner issue, under warranty, let them fix it.
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Old 04-15-2019, 03:46 AM   #6
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Quote:
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Freighliner issue, under warranty, let them fix it.
Hey you just blew your chance to rag on spartan! This is a failure on a chassis not made by freightliner, and you missed it.
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Old 04-15-2019, 03:50 AM   #7
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Quote:
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The thing thatís throwing me is in both pictures it looks like it sprayed out
I assume there is pressure involved in the delivery system, but no idea where it is generated.

Once you remove the assembly, look for cracks too.

It is possible that being at the rear, it is bouncing out instead of spraying, but I agree it does appear to be sprayed.
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Old 04-15-2019, 04:57 AM   #8
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Spraying? Sure it isn't from the wind when driving or the fan. I don't have access to Spartan documentation, but Freightliner shows a vent on top.

Is it possible it overfilled and spilled from the vent?
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Old 04-15-2019, 06:03 AM   #9
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One way to test for spraying is to run the engine at high idle and observe the area. Def is being consumed during idle at the same or higher rate than when driving.
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Old 04-15-2019, 06:14 AM   #10
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DEF is drawn from the tank by the DEF pump. The DEF is then filtered and, from the pump, transported through the DEF lines to the metering unit. The metering unit measures the correct amount of DEF, which is then injected into the hot exhaust flow after exhaust gases have passed through the ATD.
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Old 04-15-2019, 07:06 AM   #11
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Quote:
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Spraying? Sure it isn't from the wind when driving or the fan. I don't have access to Spartan documentation, but Freightliner shows a vent on top.



Is it possible it overfilled and spilled from the vent?


Thank you both for the information, as far as the tank level goes it isnít close to the top of the tank. Mine is a Spartan K2 and looks different than the picture.
You and Redís thoughts on splash not pressure could be, I will take it apart at home for further inspection.
After both pictures above I completely cleaned up. The pictures are the result of driving 370 miles. The second days picture was a little less so maybe tank level is a factor.update to come later today.
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Old 04-15-2019, 09:55 AM   #12
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I fill mine at the tank using the 2 1/2 gallon jugs. I have filled it to the top of the filler neck and not had any leaking like you show.

Thought maybe you got more into the tank because you filled from the other side but that doesn't sound like that is the case. Something must be loose, as you say.

Again this may not apply to your Spartan but here are a couple warnings from Freightliner.

NOTICE
To disconnect a DEF line, push the line coupling in towards the male connector to move the holding clip to the unlocked position, then compress the prongs of the holding clip and pull the line off of the male connector. Failure to properly remove a DEF line can result in damage to a line coupling or DEF port.

IMPORTANT: To connect a DEF line, push the line coupling onto the DEF port male connector, then pull back gently on the coupling to engage the holding clip in the locked position.
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Old 04-15-2019, 10:29 AM   #13
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Okay.....studying your pictures.....here is my guess. If you fill from the passenger side, the fill opening is several inches below the top of the tank. If you fill from the driver's side, the filler hose is coming in at the TOP of the tank. You can only fill the tank so full on the passenger side, but you can fill all the way to the top when using the remote as you said you did. I think when you filled it from the driver's side, it went right to the top of the tank. The rubber o-ring, under the blue tubing assembly started leaking as it had DEF up against it.

I believe it leaked out from around the seal, puddled and then bounced around as you drove down the road, eventually getting sprayed by the engine fan. You can see some puddling around the blue tubing assembly.

It looks like you release the screws, twist and lift out to replace the seal/o-ring. This is the same way GM seals the hoses going into their RV fuel tanks.
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Old 04-15-2019, 12:10 PM   #14
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When you check it at idle have someone turn the engine off and look for a leak. Evrytime you turn the engine off it pumps the def back in the tank so the line doesnít freeze
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