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Case Tractors Discussion Forum

Case 830 fuel sender/gauge

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AJ in IL

01-20-2015 13:46:06

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Hi, I recently rewired my 830 and found a broken wire at the fuel sending unit. After fixing the wire the gauge still doesn't work. It stays on empty.I have 12 volts at gauge and 0 volts at wire connection at sending unit. I took a test light from pos. battery post to tank and get no light.That tells me the tanks not grounded. Will the gauge or sender work if that's the case? do i need to ground the tank? Can i run a wire from a screw that mounts the sending unit to ground? Thanks for any help.

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Paul A Young

01-21-2015 15:13:17

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 Re: Case 830 fuel sender/gauge in reply to AJ in IL, 01-20-2015 13:46:06  
I think the sender needs to be grounded as well as the gauge.

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AJ in IL

01-20-2015 15:41:40

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 Re: Case 830 fuel sender/gauge in reply to AJ in IL, 01-20-2015 13:46:06  
I'm going to pull the sending unit in the morning. i had a wire hooked up wrong and just changed it, now I have 12 v. at the gauge on the power side and on the sending unit wire side . I was told if i take a jumper wire from the hot post and touch the other post i should see the gauge jump from E to F. It does nothing.Also does the tank need to be grounded for the gauge to work? Thank You

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Case Nutty 1660

01-20-2015 15:47:27

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 Re: Case 830 fuel sender/gauge in reply to AJ in IL, 01-20-2015 15:41:40  
to test the gauge, unhook the wire to the sending unit, turn on key switch the ground the removed wire from the sending unit, if the gauge is good it will peg the needle at full

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AJ in IL

01-20-2015 16:35:21

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 Re: Case 830 fuel sender/gauge in reply to Case Nutty 1660, 01-20-2015 15:47:27  
Thanks, I'll give that a try in the morning and post how that goes..

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01-20-2015 14:58:22

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 Re: Case 830 fuel sender/gauge in reply to AJ in IL, 01-20-2015 13:46:06  

The sending unit is typically a variable resistor and a float. Rather than using a voltage meter, you need to use an ohm meter and measure resistance with the float in full up and full down position. If they both read the same it is possible that dirt or grime is preventing a good connection with the variable resistor. Move the float up and down a few times and re-measure resistance. If up and down still read the same, you probably need a new sending unit.

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