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2013 Cascadia fuel problems, over fills the drivers side tank.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by bangstick!1, Jan 18, 2021.

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  1. Jan 18, 2021 #1
    bangstick!1

    bangstick!1 Bobtail Member

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    Jan 18, 2021
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    hello everyone, my 2013 Cascadia has a fuel problem, i bought it used and since ive owned it, i can drive it and it will pull fuel from the pass side tank only, when i fuel, it will over fill the drs tank, if I leave the unit alone over night the tanks will equilize.I checked all the usual problems, fuel caps ,vents and collapsed lines nothing bad. the former owner removed and bypassed the fuel shutoff valves from the factory.no fuel leaks runs great. I cannot seem to figure this out. can anyone of you help?
     
    bangstick!1, Jan 18, 2021
    bangstick!1, Jan 18, 2021
    #1
    petefan4000 Thanks this.
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  3. Jan 18, 2021 #2
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    I would still focus on the vents/breathers. Remove them and clean them out really good, and blow air in them.
     
    Diesel Dave, Jan 18, 2021
    Diesel Dave, Jan 18, 2021
    #2
  4. Jan 18, 2021 #3
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    Or maybe the return line. Mine has a splitter for the return.
     
    Diesel Dave, Jan 18, 2021
    Diesel Dave, Jan 18, 2021
    #3
  5. Jan 18, 2021 #4
    bad-luck

    bad-luck Road Train Member

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    Sounds like the either the pick up line in the tank or the fuel line in the drivers side fuel tank is clogged with debris
     
    bad-luck, Jan 18, 2021
    bad-luck, Jan 18, 2021
    #4
  7. Jan 18, 2021 #5
    bangstick!1

    bangstick!1 Bobtail Member

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    thank you, ive done just that no obstructions i even put on new vents do difference.
     
    bangstick!1, Jan 18, 2021
    bangstick!1, Jan 18, 2021
    #5
    Diesel Dave Thanks this.
  8. Jan 18, 2021 #6
    bangstick!1

    bangstick!1 Bobtail Member

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    i will recheck. thank you
     
    bangstick!1, Jan 18, 2021
    bangstick!1, Jan 18, 2021
    #6
    bad-luck Thanks this.
  9. Jan 18, 2021 #7
    bangstick!1

    bangstick!1 Bobtail Member

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    Jan 18, 2021
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    mine has a t fitting i donot know if it is just a brass t or is there a check valve in it
     
    bangstick!1, Jan 18, 2021
    bangstick!1, Jan 18, 2021
    #7
  10. Jan 18, 2021 #8
    Diesel Dave

    Diesel Dave Last Few of the OUTLAWS

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    My return line had a factory T-splitter which had a flapper valve in it and it was mounted above the transmission. One day it just started leaking so I just replaced it. When I started getting more fuel in one of the 2 tanks, it was clogged vents.
     
    Diesel Dave, Jan 18, 2021
    Diesel Dave, Jan 18, 2021
    #8
  11. Jan 18, 2021 #9
    baha

    baha Road Train Member

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    The splitter diesel Dave is talking about is what puts fuel into one tank and leaves the other side dry when it goes bad, it will be at rear of trans. follow fuel lines to find it, change it out for a new one ,
     
    baha, Jan 18, 2021
    baha, Jan 18, 2021
    #9
  12. Jan 18, 2021 #10
    kemosabi49

    kemosabi49 Trucker Forum STAFF Staff Member

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    I had that happen on a FLD I had. Turned out there was some crap in the tank that kept getting sucked into the outflow fuel line and plugged it up. So it was only drawing fuel from the right tank but still returning it to both tanks. Ended up getting a used tank because we never could get all of the crap out.
     
    kemosabi49, Jan 18, 2021
    kemosabi49, Jan 18, 2021
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    Accidental Trucker Thanks this.
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