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  1. #1
    Bobtail Member medbill38's Avatar
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    Fuel tank problems 2004 century freightliner

    OK SO LETS START WITH THEY PUT SUGAR IN THE TANKS BUT IT NEVER GOT TO THE MOTOR TANKS WERE CLEANED OUT NOW THE RIGHT TANK IS HARDLY THROWING DIESAL INTO THE LEFT TANK....ALL THE FUEL LINES HAVE BEEN BLOWN OUT AND ALL THE VALVES HAVE BEEN CHANGED??????? 4 MECHANICS HAVE LOOKED AT IT AND CAN'T FIGURE OUT THE PROBLEM.........HELPPPPPPPPPP!!!!!!


  2. #2
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    I have this problem occasionally, when I go to fill up one tank is more empty than the other. It will be interesting to see what folks say. So out of curiousity who put sugar in your tank? What about getting locking fuel caps?

    Mine doesnt have an equalizer hose (03 Century) it has that valve on top of the tranny that all the lines hook into. I am sure that is where the problem is. I would guess. Does yours have the tank shut offs coming out under the driver's door?

  3. #3
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    Check/replace proportioning valve that controls the return to the tanks, and check the vents on each tank.

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  5. #4
    Road Train Member GrapeApe's Avatar
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    What do you mean by "the right tank is hardly throwing diesel into the left tank"? Is one tank draining faster than the other? What valves were changed? You should only have 1 valve on the return side, unless you have a left/right/both valve.

    The majority of unequal draw problems on a dual draw system are a restriction somewhere, the reed valves in the return Tee is next. An intermittent problem is almost always a small piece of trash in the tank that occasionally blocks the pickup (foil seals from fuel additives tops the list). How did you clean the tanks? I have seen the return line inside the tank crack. This will cause a problem when the fuel in the tanks expose the crack, so if the tube is cracked 1/2 way down, it will work fine until you run lower than 1/2 tank, then you'll get unequal return. I have also seen the hoses deteriorate internally, blowing them out doesn't help, air pushes past rubber flappers pretty easy. A restriction only has to be enough for fuel to be drawn easier from 1 side.

  6. #5
    Bobtail Member medbill38's Avatar
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    we have eliminated the shut off valves on driver side door and ran all the lines direct also eliminating the valves on top of tranny and still doesn't work!!!

  7. #6
    Bobtail Member medbill38's Avatar
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    vents have been checked but havent checked proportioning valve yet !!!

  8. #7
    Bobtail Member medbill38's Avatar
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    thanks for all this info its helpful, maybe it was the additives, the mechanic will be looking inside the tanks tomorrow!!!

  9. #8
    Road Train Member GrapeApe's Avatar
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    Quote Originally Posted by medbill38 View Post
    we have eliminated the shut off valves on driver side door and ran all the lines direct also eliminating the valves on top of tranny and still doesn't work!!!
    On top of the tranny there should be just a regular tee on the suction side. On the return side there is an aluminum tee valve that you need to have equal draw. Inside it is two reed valves, which are important. They direct fuel return flow to the tank with the lowest level to equal them out.

  10. #9
    Bobtail Member medbill38's Avatar
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    will also have that checked out thank you!!!

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