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Tanks not equalizing

Discussion in 'Peterbilt Forum' started by krazzyboi_44, Jan 23, 2026.

  1. Jan 23, 2026 #1
    krazzyboi_44

    krazzyboi_44 Light Load Member

    298
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    Apr 30, 2008
    BAton Rouge,Louisiana
    0
    I have a 389 peterbilt with a paccar, The fuel is being pulled from the drivers side tank filling up the passenger side. A couple days ago I unlatched the drivers side fuel cap while I was on my 10hr break. The tanks leveled out and started back working. Now its doing it again. How can I fix this?
     
    krazzyboi_44, Jan 23, 2026
    krazzyboi_44, Jan 23, 2026
    #1
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  3. Jan 23, 2026 #2
    JB7

    JB7 Heavy Load Member

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    Dec 13, 2022
    Laurel, MD
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    Sounds like a venting problem. Check any vents. Some fuel caps are vented so it may be a bad cap. Switch the fuel caps if you can and see what happens.
     
    JB7, Jan 23, 2026
    JB7, Jan 23, 2026
    #2
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  4. Jan 23, 2026 #3
    Judge

    Judge Road Train Member

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    Arkansas
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    Find vent tube on top. Run small stick or metal clothes hanger to clear blockage. Dirt dobbers have blocked them tubes too
     
    Judge, Jan 23, 2026
    Judge, Jan 23, 2026
    #3
    Rideandrepair, TurkeyCreekJackJohnson, OldeSkool and 2 others Thank this.
  5. Jan 23, 2026 #4
    blairandgretchen

    blairandgretchen Road Train Member

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    South west Missouri
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    Or splitter valve on return.
     
    blairandgretchen, Jan 23, 2026
    blairandgretchen, Jan 23, 2026
    #4
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  7. Jan 25, 2026 #5
    '88K100

    '88K100 Road Train Member

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    Aug 23, 2020
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    The vent is frequently the culprit as many hang between tank and frame and get packed with ice during inclimate weather
    Dumping fuel conditioner in tanks can free up the splitter valve, or just park in heated shop overnight to defrost everything
     
    '88K100, Jan 25, 2026
    '88K100, Jan 25, 2026
    #5
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  8. Jan 25, 2026 #6
    Tall Mike

    Tall Mike Road Train Member

    7,596
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    Aug 20, 2014
    New York State
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    I had that happen on a Junkliner Classic XL I owned in the late 90's.
    A plugged vent hose was the culprit.
     
    Tall Mike, Jan 25, 2026
    Tall Mike, Jan 25, 2026
    #6
    Rideandrepair and Oxbow Thank this.
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