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hissing when you open fuel tank cap

Discussion in 'Trucks [ Eighteen Wheelers ]' started by bonesause, Mar 12, 2014.

  1. Mar 12, 2014 #1
    bonesause

    bonesause Bobtail Member

    20
    6
    Sep 7, 2012
    Tucson az
    0
    Im' runing a 90 IH 9300 with the ntc 350 cummings; when the fuel tank caps are opened it almost sounds like a gas job thats been in the sun building pressure. Performance and econmy has been somewhat down especially acceleration. The symptom does seem more like vacum because the fuel cap does fight comming off?? Pump have a regulator or is it on a filter or???? Help!
     
    bonesause, Mar 12, 2014
    bonesause, Mar 12, 2014
    #1
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  3. Mar 12, 2014 #2
    Heavyd

    Heavyd Road Train Member

    7,812
    6,265
    Feb 4, 2009
    0
    Tanks should be vented. Check to see if the vents are plugged.
     
    Heavyd, Mar 12, 2014
    Heavyd, Mar 12, 2014
    #2
    Cetane+ and chalupa Thank this.
  4. Mar 12, 2014 #3
    rebeloutlaw66

    rebeloutlaw66 Light Load Member

    199
    41
    Sep 2, 2009
    0
    Your vents are clogged, internationals are notorious for this because the cap is not vented, you should have a vent in the top of the tank with a rubber hose and that hose will get clogged with dirt or debris and cause the tank to vapor lock and not be able to draw fuel from that tank,
     
    rebeloutlaw66, Mar 12, 2014
    rebeloutlaw66, Mar 12, 2014
    #3
  5. Mar 13, 2014 #4
    nikmirbre

    nikmirbre Road Train Member

    5,554
    10,211
    Jul 27, 2011
    High Point NC
    0
    There is a snake in your tank, stay away from it! Be careful when opening your tank, they are called tank snakes. They are notorious there in the southwest. Your in Tucson, surprised you haven't heard of them :)
     
    nikmirbre, Mar 13, 2014
    nikmirbre, Mar 13, 2014
    #4
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