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  1. #1
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    Default Discovery 2 v8 fuel guage not working

    I know this has been discussed, I've run a search and not quite found what I'm looking for.

    2003 v8, fuel gauge dead.
    Mikebob swapped out the sender unit and the instrument cluster, the temp gauge also wasn't working and the instrument swap sorted that but the fuel gauge stayed on nil with the light burning.

    I don't have a diagnostic tool anymore and before I start just pulling things off left, right and center I thought i would pick the collective brain here.

    If I have to send it back to an indy at the end of Feb I will but I need the vehicle for work, so if i can sort it, that'll be first prize. I keep expecting to run out of fuel.

    Thanks.
    Zach

  2. #2
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    Default Re: Discovery 2 v8 fuel guage not working

    Quote Originally Posted by Chopped View Post
    I know this has been discussed, I've run a search and not quite found what I'm looking for.2003 v8, fuel gauge dead.Mikebob swapped out the sender unit and the instrument cluster, the temp gauge also wasn't working and the instrument swap sorted that but the fuel gauge stayed on nil with the light burning.I don't have a diagnostic tool anymore and before I start just pulling things off left, right and center I thought i would pick the collective brain here.If I have to send it back to an indy at the end of Feb I will but I need the vehicle for work, so if i can sort it, that'll be first prize. I keep expecting to run out of fuel.Thanks.Zach
    At the fuel pump, ground the fuel sender wire. If the fuel gauge needle go to full, its the sending unit in the tank. If the needle does not move, its either a wiring problem or a problem inside the cluster.
    2006 VW Touareg 4.2 V8 Auto
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  4. #3
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    Default Re: Discovery 2 v8 fuel guage not working

    Does this look right?
    There are two plugs, one with thicker wires which is what I assume to be the fuel pump?
    The smaller plug has 3 smaller wires. Red/black, red and green/white. Surely this one should be plugged in somewhere? Name:  IMG_20210202_095855.jpg
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  5. #4
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    Default Re: Discovery 2 v8 fuel guage not working

    Did you try to fish for the missing connector between the body and tank? It should be close to the pump harness . Maybe got pulled out while you were working underneath the car??

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  7. #5
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    Default Re: Discovery 2 v8 fuel guage not working

    I'll check it out. I haven't been underneath yet. I only got the vehicle on Friday. Thanks for this
    Quote Originally Posted by Duke1098 View Post
    Did you try to fish for the missing connector between the body and tank? It should be close to the pump harness . Maybe got pulled out while you were working underneath the car??
    Last edited by Chopped; 2021/02/02 at 10:49 AM.

  8. #6
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    Default Re: Discovery 2 v8 fuel guage not working

    In my case, the gauge stopped working after I removed the tank.
    While taking the pump out I must have bent or stressed a connecter on the pump itself.
    Shortly after putting everything back together, the gauge died.
    When I took the pump out again, I found a thin wire dangling. Once that was fixed, everything went back to normal.
    2001 Disco 2 V8 XS

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  10. #7
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    Default Re: Discovery 2 v8 fuel guage not working

    The unconnected plug is C0132 for fuel tank pressure sensor which is used only on NAS modells, the sender's output is from the connected plug the thinner green/black - pink/black wires, if you bridge them the gauge should rise then maybe drop again cos the resistance for full tank is 15 Ohm. If the gauge doesnt react when you bridge those wires the problem is elswhere on the circuit
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  12. #8
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    Default Re: Discovery 2 v8 fuel guage not working

    Quote Originally Posted by sierrafery View Post
    The unconnected plug is C0132 for fuel tank pressure sensor which is used only on NAS modells, the sender's output is from the connected plug the thinner green/black - pink/black wires, if you bridge them the gauge should rise then maybe drop again cos the resistance for full tank is 15 Ohm. If the gauge doesnt react when you bridge those wires the problem is elswhere on the circuit
    Thank you very much for this.

  13. #9
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    Default Re: Discovery 2 v8 fuel guage not working

    I may have made some progress.
    Haven't had time to touch the Landy in afew weeks but I had an hour spare this morning and I have been googling in my spare time.
    The wiring harness runs from the tank, through to the front to a round grey plug, behind the fuse box in the engine bay. The harness then runs back behind the instruments.
    So i open the bonnet, get a torch and start scratching and low and behold, a dead something. Looks like a rat. I think he or she has eaten the wiring down there, between the round grey plug and the firewall.
    Its not often that i don't feel sympathy for a dead creature. Today was one.
    Now for the cleanup and will trace, solder, heatshrink and fix. Weekend plans made.

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