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Old 04-12-2011, 12:39 PM   #1
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Fuel Guage Reading reverse

My fuel guage reads reverse when full reads empty etc. was like this when I got JEEP is it possible wires could be crossed somewhere or is there even 2 wires that can be crossed or just bad sending unit. THanks

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Old 04-12-2011, 12:44 PM   #2
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They did the money in the wallet mod to the gauge when you fill up it shows how much money you have and vice versa.... sorry couldn't help myself I honestly can't givd you a straight answer.

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Old 04-12-2011, 02:36 PM   #3
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The wires are crossed either at the gauge or sending unit. Since it seems to work well I would check at the sending unit since that was probably replaced.
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Old 04-12-2011, 02:39 PM   #4
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I just did a quick search, and it looks like the stock sending unit should read 0 ohms when empty and 90 ohms when full. It sounds like someone put a junkyard pump/sending unit in the tank with different ohm readings. I don't think that you can just swap wires, but I am not an electrical guru either. Different manufacturers use different ohm readings on some sending units, i.e. 0 Full-90 Empty, 120 Empty-30 Full etc.

edit:What kik said, try switching wires first, it might work?
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Old 04-12-2011, 04:20 PM   #5
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Yeah thanks for the advise I will check wires 1st, do you have to drop tank to get to the sending unit wires?
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Old 04-13-2011, 12:24 PM   #6
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Sending Unit

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Originally Posted by DiabloGrande View Post
Yeah thanks for the advise I will check wires 1st, do you have to drop tank to get to the sending unit wires?
You have to drop the fuel tank to get to the sending unit wires unless you have a fuel pump access panel in your rear seat/cargo area. My 93 YJ doesn't have one - so out comes the tank.

My advice - do all that needs to be done under there while you have it off because it's no fun to remove or reinstall the fuel tank. Actually it is FUN, it's just not easy. Good luck!
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Old 04-13-2011, 01:03 PM   #7
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If the sending unit is a three lead potentiometer and you reverse the outside two leads, you would get the same effect as what you are describing. Reversing the indicator on the dash would cause it to go backwards from empty (unless it is a center zero type indicator). If it is a center zero type indicator, then you might get the effect you are describing by accidentally reversing the leads at the dash.
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Old 04-13-2011, 01:56 PM   #8
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Quote:
Originally Posted by Buddha View Post
You have to drop the fuel tank to get to the sending unit wires unless you have a fuel pump access panel in your rear seat/cargo area. My 93 YJ doesn't have one - so out comes the tank.

My advice - do all that needs to be done under there while you have it off because it's no fun to remove or reinstall the fuel tank. Actually it is FUN, it's just not easy. Good luck!
disagree! it's not fun at all! it completly SUCKS......especially when your teenage helper decides to disappear and play black ops or something like that........
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Old 04-13-2011, 02:26 PM   #9
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Fun

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disagree! it's not fun at all! it completly SUCKS......especially when your teenage helper decides to disappear and play black ops or something like that........
Well, I have to admit that I haven't put mine back in yet - I am waiting on a new sending unit. When that gets here and I try a one-man reinstall I may have to agree with you. But hey - a bad day working on a Jeep is still a good day right?

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