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Thread: Drain DEF tank

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    Drain DEF tank

    How do you guys drain your DEF tank?

    I have a 2017 RAM 2500.

    Thanks in advance.


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    MOD watersupply189's Avatar

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    Re: Drain DEF tank

    Quote Originally Posted by 17cummings View Post
    How do you guys drain your DEF tank?

    I have a 2017 RAM 2500.

    Thanks in advance.
    I think you have to take it out and drain, flush it out.

    I’ve never done it but I know there are some on here that has drained theirs.

    Hopefully somebody will chime in.


    2016 Ram Laramie 3500 (DRD), G56, 6.7, Rough Country Leveling, HID headlights, Morimoto LED fogs plus a whole lot more!

    2016 RAM 3500 4x4 Laramie Crew Cab
    Cummins,G56, Rough Country level, Morimoto LED fog lights, LED headlights, Lund Attitude Steps sprayed with Line-X, DRL's Activated, 35x12.50R18 Falken Wildpeak ATW3, Fuel Vapor Wheels Matte Black w/Dark Tint, A.R.E. Truck cap and swing boxes

  4. Top Of Page | #3
    Daily Grinding! RamIt's Avatar

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    Re: Drain DEF tank

    What @watersupply189 said. Drop the crossmember and remove the tank, then flush it, preferably with distilled water, let it dry and reinstall or don't.

    2021 3500 Mega HO DRW

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    MRMAYHEM's Avatar

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    Re: Drain DEF tank

    I’ve read some of your other posts so I think I know what you are trying to accomplish.

    To drop the DEF tank, there are two electrical connectors to unhook a skinny one on the side of the tank and one on top.

    There are actually two connectors on top but you only have to unclip the one closest to the front of the truck.

    Take the doser line of the injector.

    Remove the filler tube and vent tube from the tank.

    There are two green tabs for each hose.

    Press them in and the hose will slide off the tank.

    Repeat for the vent tube.

    There are 6 bolts holding the cross member, 4 on the driver's side, 2 on the passenger side.

    I used a floor jack with a piece of wood to hold upon it while I removed the bolts. (I did all this by myself).

    Once the bolts are out you can lower the crossmember and tank to the floor. Slide it out from under the truck. There is a tank strap holding the tank on the crossmember. Remove the one nut holding it on. There is also what looks like a ground cable running from the pump to the crossmember. Remove that bolt. Your doser line that’s wrapped in “tin foil” is just plastic clipped in the channel.

    Remove the clips. The tank is now free from the cross member.

    I then reinstalled the cross member empty. I know it probably seems like a big deal but honestly it wasn’t that bad. (I had to YouTube the hose connections.

    Thought they would have to be pulled out, fought with that for a while). LOL.

    In this pic, you’ll see the crossmember on the floor with the tank removed.

    Hope this helps.




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    2012 Dodge 2500 6 inch suspension lift 4 inch body lift sitting on 41's DPF delete Straight pipe turbo back twin stacks road armour front and rear bumpers mini max tuner...tuned by DOUBLE R DIESEL

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    MRMAYHEM's Avatar

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    Re: Drain DEF tank

    I forgot to mention the skid plate! (Not sure if all trucks are equipped with the transfer case skid plate?).

    Mine had it... 4 bolts easy peasy.

    Two of the bolts screw into the cross member.


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    2012 Dodge 2500 6 inch suspension lift 4 inch body lift sitting on 41's DPF delete Straight pipe turbo back twin stacks road armour front and rear bumpers mini max tuner...tuned by DOUBLE R DIESEL

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  9. Top Of Page | #6
    6.7 Coal Train's Avatar

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    Re: Drain DEF tank

    I didn't bother with mine.

    Just driving around with a couple gallons of DEF crystals now I'm sure.

    2017 2500 Laramie: DRD Juiced, 5" TBE, Invisible EGR mod, BD Iron Horn 364sxe/1.0AR, 20x10 Hostile Sprockets, 33x12.50 General Grabber A/T, HID Conversion, Reverse Level 2" Drop CSS Rear Coils

  10. Top Of Page | #7
    BlackBart's Avatar

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    Re: Drain DEF tank

    Double posted

    Good stuff.... Truckers bring it

  11. Top Of Page | #8
    BlackBart's Avatar

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    Re: Drain DEF tank

    Quote Originally Posted by 6.7 Coal Train View Post
    I didn't bother with mine.

    Just driving around with a couple gallons of DEF crystals now I'm sure.

    How long since ya did it?


    Good stuff.... Truckers bring it

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    6.7 Coal Train's Avatar

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    Re: Drain DEF tank

    Quote Originally Posted by BlackBart View Post

    How long since ya did it?
    Little over a year now.

    2017 2500 Laramie: DRD Juiced, 5" TBE, Invisible EGR mod, BD Iron Horn 364sxe/1.0AR, 20x10 Hostile Sprockets, 33x12.50 General Grabber A/T, HID Conversion, Reverse Level 2" Drop CSS Rear Coils

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  15. Top Of Page | #10
    BlackBart's Avatar

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    Re: Drain DEF tank

    Quote Originally Posted by 6.7 Coal Train View Post
    Little over a year now.

    Mine might a done crystallized now too then.


    Good stuff.... Truckers bring it

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