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Sendin unit issue

montanamopar

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Nov 28, 2015
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My 73 Challenger new fuel sending unit measures 72 ohms full at9 ohms empty which Is accurate however at half full its at 54 ohms. My Rally fuel gauge shows empty at 1/2 full. Thoughts?
 

Katfish

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Maybe remove the sender from tank and test externally with gauges so you can see exactly where the arm is. Measured ohms seems correct, so maybe problem with travel inside tank?
 

marks ebody

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Feb 27, 2015
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I make sure that the tank sending unit is sitting at the bottom of your tank. The pick up tube could be sitting too high.
 

AUSTA

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Check the resistance between the tank sender ground & the dash ground you could have a high resistance joint
 

Coupe

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May 6, 2016
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Units can wear out in the middle of the resistor scale.Keep the tank between 1/4 and 3/4 full and that's where it wares out first.
 
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