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Fuel tanks not equalizing and left tank empties faster than right one

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Carmona, Nov 17, 2021.

  1. Nov 17, 2021 #1
    Carmona

    Carmona Bobtail Member

    4
    0
    Nov 17, 2021
    0
    I have a 2000 pete 379 for the past 2 weeks I've been having issues where the tanks do not equalize left tank empties faster than the right. I have replaced the vents, splitter valve, fuel lines. I'm to the point where I have to shut the valve and run with one tank. I've checked the tanks and they seem to be pretty clear of any debris or algae. Any one else who may have an idea of what it could possibly be?
     
    Last edited: Nov 18, 2021
    Carmona, Nov 17, 2021
    Carmona, Nov 17, 2021
    #1
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  3. Nov 17, 2021 #2
    FLHT

    FLHT Road Train Member

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    Aug 2, 2014
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    Old fuel lines have a tendency to collapse on the inside.
     
    FLHT, Nov 17, 2021
    FLHT, Nov 17, 2021
    #2
  4. Nov 18, 2021 #3
    Ross_Tech

    Ross_Tech Light Load Member

    133
    134
    Aug 31, 2021
    Michigan
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    The 't' or splitter valve or fuel lines may be restricted on the return side. I'm not sure if that's what you meant by "valve".
     
    Ross_Tech, Nov 18, 2021
    Ross_Tech, Nov 18, 2021
    #3
  5. Nov 18, 2021 #4
    Carmona

    Carmona Bobtail Member

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    Nov 17, 2021
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    Yes the splitter valve is what I changed it is brand new I replaced the fuel lines aswell.
     
    Carmona, Nov 18, 2021
    Carmona, Nov 18, 2021
    #4
  7. Nov 18, 2021 #5
    Carmona

    Carmona Bobtail Member

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    Nov 17, 2021
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    I thought that would be it so I went ahead and replaced them with new ones.
     
    Carmona, Nov 18, 2021
    Carmona, Nov 18, 2021
    #5
  8. Nov 18, 2021 #6
    Snailexpress

    Snailexpress Road Train Member

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    Apr 28, 2014
    Rocky
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    Crack on pick up tube inside the tank if fuel pick up is from the top. Defective tube will suck mostly air not fuel and return flow is equal. So you have overfilling tank.
     
    Snailexpress, Nov 18, 2021
    Snailexpress, Nov 18, 2021
    #6
  9. Nov 18, 2021 #7
    rch10007

    rch10007 Medium Load Member

    560
    860
    May 26, 2007
    Madison, AL
    0
    My 2000 379 does the exact same thing...I thought it was normal? The right tank is always about a 1/4 behind the left but as they both get closer to E, the gap between them decreases.
     
    rch10007, Nov 18, 2021
    rch10007, Nov 18, 2021
    #7
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