fuel tanks won't balance

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Dustyroads38, Jan 26, 2022.

  1. Dustyroads38

    Dustyroads38 Light Load Member

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    Dec 23, 2015
    Vernal utah
    0
    well first off, let's explain the stupidity that got me into my current dilemma...
    I am currently hauling oilfield directional tools, last night i pulled around the back side of the rig and drove over what is essentially an oversized speed bump. whilst driving over it my better brain says "hey dumb A thats pretty big hope it doesn't snag your tanks," being the rocket scientist i am, i proceeded forward and broke the brass fitting on coming out of the bottom driver's side tank. through all my redneck mechanical problem solving ability, i managed to get it bandaged together with electrical tape and two bungy cords. i had one more rig to go to and then about 60 miles back to our shop.
    no biggie right? ran out of hours, crashed out for the night after putting 60 gallons split between both tanks. bed time each tank registered just over 1/4.
    my problem
    as i finished up gathering tools and headed for the shop, my passenger tank reads empty and drivers side full. so somehow they are not equalizing. if i close the valve ro my passenger tank that feeds my cross over line, magically, it stops over filling the driver's side tank. the return only flows into the drivers side and idk if the solution is to build a crossover for the return, or if it'll start equalizing again once my broken fittings are repaired.
     
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  3. MRMTRANS

    MRMTRANS Light Load Member

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    Apr 28, 2015
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    I've had firsthand experience dealing with this issue and figured out that the slightest change in anything that can effect fuel flow rate through the the lines will lead to an imbalance of fuel in tanks. In my case, I had a supply line from the tank to the T-fitting that sits on the tranny start leaking. Had it replaced at a truckstop. Ten had imbalance. Figured out that even different brands of fuel lines (even though they were both #10 or #8) was my problem. I eventually put the same brand on as the one that started leaking. There's sizing charts I found on Google for different brands, and indeed the IDs were ever so slightly different
     
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  4. Dustyroads38

    Dustyroads38 Light Load Member

    79
    75
    Dec 23, 2015
    Vernal utah
    0
    thanks. hopefully all will sort itself out. just pulled out from fixing my broken fitting. the only difference is that i put a shut off valve on the driver's side tank.
     
  5. Dustyroads38

    Dustyroads38 Light Load Member

    79
    75
    Dec 23, 2015
    Vernal utah
    0
    update. apparently my electrical tape/bungy cord fix job must have cause a little blockage between the two only allowing fuel to flow one way. no that everything is fixed i got 300 miles down and they're equalizing.
     
  6. B77

    B77 Light Load Member

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    Dec 16, 2010
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    Or check your vents
     
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  7. Dustyroads38

    Dustyroads38 Light Load Member

    79
    75
    Dec 23, 2015
    Vernal utah
    0
    spot on. one tank had a bung in it and no vent.
     
    B77 Thanks this.
  8. B77

    B77 Light Load Member

    175
    71
    Dec 16, 2010
    0
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