Fuel tank sending unit

Discussion in 'Electrical and Ignition' started by buck351, Oct 26, 2018.

  1. buck351

    buck351 Well-Known Member

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    Lately I replaced the sending unit since gauge was not registering very accurately. Current replacement not any better so I ordered on from Classic Industries that is suppose to be made to match OEM specs. Question about the filter on the pickup tube. I was having trouble getting the old one out and when I got it out the filter on the pickup tube had come off in tank. I don't see anyway of getting it out without removing the tank. So will it float or sink to the bottom. If it sinks to the bottom my not cause problems. Wondering if it will interfere with the sending unit float.
     
  2. Dana67Dart

    Dana67Dart Most undignified way to get to Colorado!

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    Don't know if it would float or sink, BUT the filler is a very straight shot and with a flashlight you can see into the tank. You might get lucky with a long grabber and be able to find it. USE EXTREME CAUTION WITH ELECTRONICS AND FUEL TANK!!!!!

    Also with the tank empty and the sender out you might be able to find it.

    My best guess is if you do nothing it will just be in there and cause no harm. If the sender stops functioning then pull tank as it may have gotten stuck somewhere.


    By the way how is the Classic sender working out?
     
  3. buck351

    buck351 Well-Known Member

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    Hard to see in the sending unit hole with other items of the car in the way. Haven't received the Classic Industries one yet. I will post back on how it works related to amount of fuel the tank takes compared to the gauge reading. The current one in the tank reading 1/4 tank takes 8 gallons to fill it.
     
    Last edited: Oct 26, 2018
  4. Freezerman

    Freezerman Well-Known Member

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    You need to get a metermatch from technoversions. Its a little box you connect between the sending unit and the gauge. It has an adjustable correction factor in it for the resistance in the sending unit. It works very well.
     
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    • Dana67Dart

      Dana67Dart Most undignified way to get to Colorado!

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      Agreed. Thought. disconnect shocks, and let rear droop to the max might buy some "head" room. WATCH brake lines!
       
    • buck351

      buck351 Well-Known Member

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      The sending unit came today from Classic Industries. Did a quick check on ohms from each stop on the float travel. Range is 7.2 to 68.5. The old one that came out on the last replacement is 77 to 10. According to a post here the OEM should be 10 to 63.5 . Don't know what the range is on the one that's was put in about 3 weeks ago.
       
    • Dana67Dart

      Dana67Dart Most undignified way to get to Colorado!

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      Can you post a photo of the unit?

      Part of the issue IMHO is that some of the aftermarket sending units do not have the same travel as the OE unit and as such will stay at full for longer and show empty longer. Also the liner vs non liner aspect of things.
       
    • toolmanmike

      toolmanmike FABO Staff Staff Member FABO Gold Member

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      None of the repops are accurate as the originals.
       
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      • Dana67Dart

        Dana67Dart Most undignified way to get to Colorado!

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        This is what I got from a Mopar OEM (OE replacement from Dodge) sending unit and the aftermarket that was in the tank at the time. The OEM unit is very accurate.

        Sender resistance data.JPG