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Why is the filler on a def tank not near the top

Discussion in 'Questions From New Drivers' started by ad356, Sep 1, 2020.

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  1. Sep 1, 2020 #1
    ad356

    ad356 Road Train Member

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    Everytime I put def fluid in the truck I wonder this. Why arent these tanks more like fuel tanks. It could hold allot more if the filler wasn't nearly halfway up the side of the tank. Why are they built like that
     
    ad356, Sep 1, 2020
    ad356, Sep 1, 2020
    #1
    truckdriver31 Thanks this.
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  3. Sep 1, 2020 #2
    Cat sdp

    Cat sdp . .

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    Because when it freezes the fluid expands......
     
    Cat sdp, Sep 1, 2020
    Cat sdp, Sep 1, 2020
    #2
    magoo68, not4hire, AModelCat and 2 others Thank this.
  4. Sep 1, 2020 #3
    truckdriver31

    truckdriver31 Road Train Member

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    have you ever seen a def tank off a truck. its very very heavy duty. built like a tank.
     
    truckdriver31, Sep 1, 2020
    truckdriver31, Sep 1, 2020
    #3
  5. Sep 1, 2020 #4
    Cat sdp

    Cat sdp . .

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    Ice can be stronger then steel .....
     
    Cat sdp, Sep 1, 2020
    Cat sdp, Sep 1, 2020
    #4
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  7. Sep 1, 2020 #5
    Long FLD

    Long FLD Road Train Member

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    Fill a water jug completely full and fill a water jug half full. Freeze them both, that’s why the def tank can only be filled about halfway.
     
    Long FLD, Sep 1, 2020
    Long FLD, Sep 1, 2020
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  9. Sep 1, 2020 #5
    TheLoadOut

    TheLoadOut Road Train Member

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    So out of all the designed components on an emissions truck they got the DEF tank right?
     
    Last edited: Sep 1, 2020
    TheLoadOut, Sep 1, 2020
    TheLoadOut, Sep 1, 2020
    #5
    650cat425 Thanks this.
  10. Sep 1, 2020 #6
    Blu_Ogre

    Blu_Ogre Road Train Member

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    I would not go that far. But yep pretty close to acceptable. I would prefer another design review. Evidently Freightliner is having a problem with the filler necks pulling out...
     
    Last edited: Sep 1, 2020
    Blu_Ogre, Sep 1, 2020
    Blu_Ogre, Sep 1, 2020
    #6
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  11. Sep 1, 2020 #7
    AModelCat

    AModelCat Road Train Member

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    Yep. Frozen water expands so much you'd split a steel tank if you filled it to the brim and froze it. Gotta have room for DEF to expand.
     
    AModelCat, Sep 1, 2020
    AModelCat, Sep 1, 2020
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  12. Sep 1, 2020 #8
    not4hire

    not4hire Road Train Member

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    Ice shaped the earth.
     
    not4hire, Sep 1, 2020
    not4hire, Sep 1, 2020
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  13. Sep 1, 2020 #9
    truckdriver31

    truckdriver31 Road Train Member

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    global warming isnt real tho
     
    truckdriver31, Sep 1, 2020
    truckdriver31, Sep 1, 2020
    #9
  14. Sep 1, 2020 #10
    magoo68

    magoo68 Road Train Member

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    A buddy kept busting his cap in winter because he would squeeze as much into the tank as he could . Next morning he thinks someone hit his cap with a hammer. The second time he realized why it broke
     
    magoo68, Sep 1, 2020
    magoo68, Sep 1, 2020
    #10
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