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Old 05-05-2022, 01:13 PM
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Default Fuel Gauge Half Scale

Gents: My fuel gauge reads at half scale. I tried two different WEMA/KUS sending units, different lengths, as well as gauges with the same results. Gauges are a pretty straightforward hookup. What am I missing?
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Old 05-05-2022, 03:23 PM
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Maybe because the Biden gas is twice as much you are only seeing half scale because your getting half as much!! Sorry couldn't resist!
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Old 05-05-2022, 09:02 PM
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On your gauge take a jumper wire from the wire that comes from the tank (should be pink) touch the other end of the jumper wire to a ground with power on. (key) Gauge should peg past full. If not, going with Don on the Ziden theory..
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Old 05-05-2022, 09:47 PM
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Solid ground?
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Old 05-06-2022, 03:50 AM
Xcomunic8d Xcomunic8d is offline
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My buddy had a similar problem his gauge was shorted out by foam he installed around tank.

You already tried sending units. I’m guessing it moves up and down but only half scale? Verify your wiring and grounds. Then I’d suggest purchasing another gauge and verifying function. I’m wondering if your gauge has gone bad or is not liking signal from sending unit. I’d say sending unit but you’ve tried multiples already. That leaves wiring or gauge itself.

To check your wiring use a multimeter on ohm setting and move the sending unit back and forth you should see resistance go up and down. I’d imagine it’s resistance not volts but I’d run it through a few checks and verify function.

Last edited by Xcomunic8d; 05-06-2022 at 03:52 AM.
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Old 05-06-2022, 11:12 AM
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Thanks Gents for the help - two different gauges & sending units with same results. So Iím going to rewire the circuit and see if that does it. Short of that, guess I could use a dipstick.
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Old 05-06-2022, 11:47 AM
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There are mechanical gauges available.
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Old 05-06-2022, 03:02 PM
uncleboo uncleboo is offline
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I installed a moeller gauge and sending unit set. Thought everything was fine until I ran out of gas with the needle stopping at just under a quarter of a tank. This style was adjustable so I readjusted it and now reading full scale. Not sure if this has anything to do with yours, but, worth mentioning. (had the float rod too long so it stopped at the bottom of the tank short of the position to read empty).
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Old 05-10-2022, 01:39 PM
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For the win Alex - "What is a bad ground?" Mr. Bumpdraft is our grand prize winner of a free beer from rcnight's cooler.
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Old 05-11-2022, 05:42 PM
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Awesome! Easy fix
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