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Thread: Fuel gauge / sending unit bad?

  1. #1
    Join Date
    Mar 2007
    Tuscaloosa, AL

    Fuel gauge / sending unit bad?

    2003 Discovery , 50000 miles. My gauge began indicating improperly a few days ago? What gives? When full the needle indicates only 2/3 tank.

    Can the sending unit be removed up thru the floor of the cargo compartment?

  2. #2
    Join Date
    Apr 2006
    Rivertucky, Ca
    Sounds like a bad connection to the sending unit. I assume this has a float (others can chime in now), and if it gets a hole in it....thats the other option. But based on a little knowledge of wiring, I would guess the connector needs a clean somewhere near the sending unit...or gas tank.
    Lets not aaargue about whoooo killed whooo!

  3. #3
    Join Date
    Jan 2006
    NorCal, On the Coast.
    It could be several things.

    Bad Sender.
    Bad Wiring to the sender.
    Bad Fuel gauge.

    Unfortunately I don't know how you would check the sender and gauge separately.

    Check the wiring first and maybe you will get lucky.

    NCLR VP Web Admin
    1995 RRC County LWB
    1994 Defender 90 SW

    "Light travels faster than sound. This is why some people appear bright until you hear them speak."

  4. #4
    Join Date
    Oct 2006
    Oak Park, CA
    For what is worth,
    This is what I would do:
    in older rovers the fuel sender is fed with 10V from a Voltage stabilizer, which seems to be pretty standard for this kind of gauges/sensors.
    If you get 10V from the sensor when full it would indicate good sender.
    if you get the 10V in the instrument cluster would mean bad gauge.
    But if sender is at 10V and at the instrument cluster is much lower wiring would be the issue.
    I hope it makes sense and again I am not sure about 2003, I know my RRC and early discos would be something like that, please correct me if somebody thinks otherwise.
    <DCProven >
    <1977 Land Rover Santana, Series III, 2.25 Diesel>
    <1995 RRC, LWB, 4.2 V8>

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