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Kenworth Fuel Caps

Discussion in 'Trucks [ Eighteen Wheelers ]' started by JimmyWells, Mar 7, 2017.

  1. Mar 7, 2017 #1
    JimmyWells

    JimmyWells Road Train Member

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    I have a vented cap on one tank and non vented on the other. Aren't they supposed to be either vented OR unvented? I'd like to replace them as a set but not sure of which style to get for a matching set. It's on a 94 W9.
     
    JimmyWells, Mar 7, 2017
    JimmyWells, Mar 7, 2017
    #1
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  3. Mar 7, 2017 #2
    Kenworth 4life

    Kenworth 4life Medium Load Member

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    This depends on if you have a gravity equalizing system or a vacuum equalizing system!
     
    Kenworth 4life, Mar 7, 2017
    Kenworth 4life, Mar 7, 2017
    #2
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  4. Mar 7, 2017 #3
    JimmyWells

    JimmyWells Road Train Member

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    What's the difference?
     
    JimmyWells, Mar 7, 2017
    JimmyWells, Mar 7, 2017
    #3
  5. Mar 7, 2017 #4
    Kenworth 4life

    Kenworth 4life Medium Load Member

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    Gravity equalizing the tanks will have a fuel line at the bottom of the tanks running from one to the other! Vacuum equalizing ! The lines are at the top so while the truck is running it will create a vacuum in the ventless tank and pull fuel from the vented tank!
     
    Kenworth 4life, Mar 7, 2017
    Kenworth 4life, Mar 7, 2017
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  7. Mar 8, 2017 #5
    JimmyWells

    JimmyWells Road Train Member

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    No line on bottom of either tank, both tanks have check valve vent lines on top and the other lines are the fuel return and send lines.
     
    JimmyWells, Mar 8, 2017
    JimmyWells, Mar 8, 2017
    #5
  8. Mar 10, 2017 #6
    Dirty-Low-Walker

    Dirty-Low-Walker Medium Load Member

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    If you have vents on top of tanks you should have vent less fuel caps.
     
    Dirty-Low-Walker, Mar 10, 2017
    Dirty-Low-Walker, Mar 10, 2017
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  9. Mar 10, 2017 #7
    JimmyWells

    JimmyWells Road Train Member

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    Since the tank vents have some sort of check valve on them to let pressure out wouldn't the caps have to be vented to let in some vacuum?
     
    JimmyWells, Mar 10, 2017
    JimmyWells, Mar 10, 2017
    #7
  10. Jul 19, 2022 #8
    Pkmustang89

    Pkmustang89 Bobtail Member

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    I'm having the same issue. Have vented on one side and non vented on the other. KW t680. Which should it be??
     
    Pkmustang89, Jul 19, 2022
    Pkmustang89, Jul 19, 2022
    #8
  11. Jul 19, 2022 #9
    spsauerland

    spsauerland Road Train Member

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    Tank is vented, uses non vented caps.
     
    spsauerland, Jul 19, 2022
    spsauerland, Jul 19, 2022
    #9
  12. Jul 19, 2022 #10
    Goodysnap

    Goodysnap Road Train Member

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    Paccar tank vents are designed to let air in. The check ball in the vent keeps fuel from leaking out the vent in case of rollover.

    I don’t believe any of the fill caps are actually vented. The factory fill caps have a pressure relief valve the vents pressure if the tank pressure becomes too high. I have seen aftermarket caps that do not have this.
     
    Goodysnap, Jul 19, 2022
    Goodysnap, Jul 19, 2022
    #10
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