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DEF cap doesn't seem to vent.

Discussion in 'Peterbilt Forum' started by Edjahman, Jul 10, 2019.

  1. Jul 10, 2019 #1
    Edjahman

    Edjahman Medium Load Member

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    Hello.

    I have a brand new 579 and there is a whooshing sound when I remove the DEF cap. Is this cap supposed to vent?

    I assume it does.

    Has anyone had this problem?

    I assume that the cap is bad.

    Thank you!
     
    Edjahman, Jul 10, 2019
    Edjahman, Jul 10, 2019
    #1
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  3. Jul 10, 2019 #2
    pushbroom

    pushbroom Road Train Member

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    Cap does not vent. Vent is part of the level sensor in the top, should be a 3/8 rubber hose coming off the top down the backside of the tank. You will have to pop the rubber boot on top of the tank off to see
     
    pushbroom, Jul 10, 2019
    pushbroom, Jul 10, 2019
    #2
    Edjahman, spsauerland and Goodysnap Thank this.
  4. Jul 10, 2019 #3
    Goodysnap

    Goodysnap Road Train Member

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    The tank will usually get sucked in under vacuum when the vent is plugged. Follow the hose from the level sender around the back side of the tank. It is likely pinched or blocked somewhere. There is a black plastic filter in line with the hose. As @pushbroom says the cap is not vented.
     
    Goodysnap, Jul 10, 2019
    Goodysnap, Jul 10, 2019
    #3
    Edjahman and spsauerland Thank this.
  6. Jul 12, 2019 #5
    Edjahman

    Edjahman Medium Load Member

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    Thank you! They didn't remove the plug from the factory!

    Take care
     
    Edjahman, Jul 12, 2019
    Edjahman, Jul 12, 2019
    #5
    spsauerland, uncleal13 and Goodysnap Thank this.
  8. Jul 12, 2019 #5
    Goodysnap

    Goodysnap Road Train Member

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    I have seen this before. Plastic cap was still in the hose. Da........

    Glad it was easy.
     
    Goodysnap, Jul 12, 2019
    Goodysnap, Jul 12, 2019
    #5
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