Fuel sender unit

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  • 27th April 2026 at 8:00 pm #38091
    André
    Participant

      Hi , Is it possible to remove the fuel sender unit from the fuel tank without removing the tank, on a 1950 Slough L15.  The gauge only always reads near empty,  the tank is half full , resistance between the disconnect end from the sender cable to earth is  10 ohms. Disconnect Cable to the gauge to earth is 60 ohms . If I disconnect the cable between  sender and the gauge the needle  goes to full.  Am I correct in assuming the sender is faulty.

      28th April 2026 at 3:48 pm #38093
      Robert Filbey
      Participant

        I have a French built 1953 11BL.  I recently replaced the fuel sender unit and it was pretty straight forward.  I was able to access the unit through the trunk.  There’s a metal plate in the floor the trunk.  Remove two screws and it comes off.  Below that is the sender unit which is held in with three screws and you’ll see the wires going to it.  Disconnect, remove the unit, and then replace with a new unit.  Double check the unit is grounded well.  Hope this helps.

         

        Kirk

        29th April 2026 at 8:18 am #38095
        André
        Participant

          Thanks Robert, will have a look today . I have managed to get the gauge to indicate half full by inserting a 5ohms resistor in the cable from the gauge to the sender. So suspect a faulty sender.

          29th April 2026 at 5:31 pm #38097
          Tony Buxton
          Participant

            Attached is a picture of my working Slough sender, different to the Paris one I believe. But it sounds as if you have isolated your fault. You can see the earth wire I put from the sender case to the body. It’s always awkward testing electricity near fuel tanks.

            I am having fuel gauge problems at the moment as well, but it is my gauge that is at fault. I made one working gauge from two broken ones but the wires broke again when I tried to move the magnets to calibrate it (it would only work on the half to full sector). The wires are too thin for me to work on any more and all the gauge mending companies seem reluctant to work on it.

            Good luck

            Tony

            20260429_121019

            20260424_104722

             

            30th April 2026 at 3:18 am #38099
            Robert Filbey
            Participant

              Just for context, here’s a picture of the original fuel sender unit in my Paris built traction.  This is what I pulled and replaced.  Did not take a picture of the new unit I installed however.  Definitely different from the Slough built one.

               

              Kirk

               

              Fuel Sender Unit

               

               

               

              1st May 2026 at 4:43 pm #38101
              Tony Buxton
              Participant

                There are some good articles in FP about testing and fitting French senders and gauges but little about calibrating Slough units. I have just had a reply from Speedy Cables who will repair my gauge but it takes 5 weeks (China? India?) and it still isn’t calibrated to my sender.

                I am trying out a Series 11 Land Rover gauge which seems to work but is small and a weird shape.

                1st May 2026 at 8:53 pm #38103
                Robert Filbey
                Participant

                  Thanks for the heads up regarding the FP article.  I didn’t attempt any sort of calibration, just took the old one out and wired in the new one.  The old one was beyond repair.  I’m just happy I now have a gage that gives me an idea of how much fuel I have 🙂

                   

                  Kirk

                  2nd May 2026 at 5:37 pm #38105
                  Tony Buxton
                  Participant

                    I would have done the same if the gauge had been nearly right and if I had known how fine the magnet movements have to be. I now realise how fortunate I was to have had a gauge to watch vaguely floating about like an earth quake meter. A dead gauge isn’t any fun at all on those long journeys. My Land Rover gauge bodge is amusing me, I think I’m getting better mpg.

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