Def tank sucking in

Discussion in 'International Forum' started by Twista89, Nov 5, 2020.

  1. Twista89

    Twista89 Light Load Member

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    Oct 2, 2017
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    So for a few months now when I go to fill up the def and break the seal with the pump handle it starts to suck in air like it’s under vacuum. The tank is starting to cave in as well. Does anyone know what would cause that?
     
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  3. Just passing by

    Just passing by Road Train Member

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    I had the same issue some months ago. It's a valve inside the tank that's not letting air in as fluid level goes down. You will need to have it replaced. I don't quite remember all details but KW west Atlanta replaced it in just a few hours.
     
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  4. Dave_in_AZ

    Dave_in_AZ Road Train Member

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    Seen a MACK with a massive aluminum DEF tank the other day. 30 gallons? 50?
     
  5. AModelCat

    AModelCat Road Train Member

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    Aluminum? Ain't gonna last long before that DEF eats it up.
     
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  6. ZVar

    ZVar Road Train Member

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    Likely plastic coated on the inside.
     
  7. uncleal13

    uncleal13 Road Train Member

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    Tank vent plugged or not working right. Usually on top, may have to take off a cover to get at it. Not expensive.
     
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  8. Heavyd

    Heavyd Road Train Member

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    Yep, vent is plugged. The vent hole is located in the head unit, where the coolant and def lines connect. There will be vent line coming out and just draped down the back of most tanks. Take the line right off and look into the nipple at the head unit itself. This is where most of the blockage is. It will be just dried crusty DEF fluid. Chip it out with a screw driver or coat hanger.
     
    devedo, Flint1 and uncleal13 Thank this.
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