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Thread: Fuel guage question

  1. #1
    jodog's Avatar
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    Fuel guage question

    I bought a second ST and the fuel gauge is acting oddly. It goes down the three bars just fine but then "sticks" there until it drops to one flashing bar reading 30-40 miles left. It never displays two bars remaining. Has anyone else had this issue? Is there a fix or a likely cause?

    Bob
    Bob (Jodog) 2007 ST 1300, 2007 ST 1300 ABS
    RIP 2006 ST 1300 now known as "Deerslayer"
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  2. #2
    klaproth's Avatar
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    Re: Fuel guage question

    Mine does the same thing....it is most likely the fuel level sensor, inside the gas tank. Sometimes, the arm which has the float on it gets bent, ( it is not very stout), and it gets stuck at 3 bars, until the thermistor in the bottom tank goes dry, and shows it as almost empty. I think some folks have cleaned off the contacts, or bent the arm, or just replaced the sender. It bothered me for a while, then I just started filling up earlier.

  3. #3
    AdminiSTrator Mellow's Avatar
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    Re: Fuel guage question

    The upper tanks uses a traditional float, the lower tank a thermistor? Anyway, it takes over once you are down to that lower tank. Some have had to replace them.

    http://www.st-owners.com/forums/show...=1#post1812136

  4. #4
    AdminiSTrator Mellow's Avatar
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    Re: Fuel guage question

    From STwiki:
    Lower tank fuel sensor:

    Full sensor, in can: Panasonic ERTLG12N7 (unverified). The same sensor is believed to be used in the fuel sender assembly found in many Toyotas, particularly the 1985 Corolla. Source: http://www.southbayriders.com/forums/threads/135817
    Thermistor only: Ametherm NT05 15291

  5. #5
    docw1's Avatar
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    Re: Fuel guage question

    This happened to me last fall and kept it up for the rest of the year. Now, after winter storage with SeaFoam in the tank, it has started to work normally again. Don't know if it's cause and effect, but it is what it is.
    Two roads diverged in a wood, and I?
    I took the one less traveled by,
    And that has made all the differen
    ce.--R. Frost

  6. #6
    klaproth's Avatar
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    Re: Fuel guage question

    From what I could find out by reading, and reading between the lines: If the thermistor is bad, the fuel gauge won't work at all, just flashes the one bar. When the upper tank gets low, the fuel gauge should show one bar- the next indication is the flashing bar, indicating one gallon or so left.

    Apparently, the "arm" on the fuel level sensor is very fragile-even a hard stream of gas is enough to bend it, causing it to read high. SO, it reads 3 bars, although the upper tank is empty, until the (dry) thermistor shuts the display off, and flashes.

    The sensor is accessed under the tank, and according to one source, can be removed with the tank on, but it's tough. Not an overly expensive part, and at least one poster cured his bad sensor by cleaning the contacts with a pencil eraser. Probably a good time to replace the big tube going from tank to tank anyway.

  7. #7
    AdminiSTrator Mellow's Avatar
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    Re: Fuel guage question

    Quote Originally Posted by klaproth View Post
    The sensor is accessed under the tank,
    Nope, it's inside the tank attached to the assembly the fuel pump is attached to. You can see it here with the entire assembly out of the lower tank:

  8. #8
    klaproth's Avatar
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    Re: Fuel guage question

    Quote Originally Posted by Mellow View Post
    Nope, it's inside the tank attached to the assembly the fuel pump is attached to. You can see it here with the entire assembly out of the lower tank:
    I was referring to the fuel level sensor in the top tank....shoulda been more specific.

  9. #9
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    Re: Fuel guage question

    Quote Originally Posted by klaproth View Post
    I was referring to the fuel level sensor in the top tank....shoulda been more specific.
    Ah, okay yes you can get to it with the tank on but the top tank is pretty easy to get off so why not do that.

    It's definitely easier to replace/fix the upper sending unit than the thermistor.

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