Fuel Gauge Fluctuating

Unknown
Unknown
edited November -1 in HUDSON
I finally got around to addressing the fuel gauge on my 41. With the help of some older posts, I was able to trace the problem to the sending unit. I purchased a Ford unit from Dennis Carpenter. After some cutting and bending of the rod, I installed it.

When the car is sitting still, the gauge reading is steady and accurate, when I am driving, the gauge wanders up and down and will continue to do this until the car is at rest. Any suggestions?

Comments

  • Uncle Josh
    Uncle Josh Senior Contributor
    Sounds like a floating ground t'me. Run a wire from a mounting screw on the sender to the frame.
  • Park_W
    Park_W Senior Contributor
    Might also be a loose connection or break in the wire from sender to gauge, if it's original wire. If the latter, try running a temporary wire from the gauge (the post that's not from the ignition) to the sender, then try driving the car. If that fixes it, you've got a problem in the sender-to-gauge wire.
  • super651
    super651 Senior Contributor
    dagsota wrote:
    I finally got around to addressing the fuel gauge on my 41. With the help of some older posts, I was able to trace the problem to the sending unit. I purchased a Ford unit from Dennis Carpenter. After some cutting and bending of the rod, I installed it.

    When the car is sitting still, the gauge reading is steady and accurate, when I am driving, the gauge wanders up and down and will continue to do this until the car is at rest. Any suggestions?



    This will happen when the FLOAT IS TO LIGHT.

    check and be sure it is the same Weight as the Orig. Put the float in a container of water and when the Float is about Half in the water thats when it is more Stable. ( thats with the float on the arm ) When it floats on top of the liquid it will be very unstable .

    If the arm is to short it will bounce more. Make sure that the angle is the same as Hudson.

    Hope this helps. Rudy. (i had a carpenter unit also)
  • Unknown
    Unknown
    Thanks for the suggestions. I will run a new wire to the sender, also I did notice that the float that came with the new sending unit was not brass like the original; it was plastic. That may be the problem. Thanks everyone!!!!
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