Question about Jeep Wrangler

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I have a 92 yj and i have hooked up an aftermarket fuel gage but it reads full when empty and empty when full. not sure i have the right sending unit wire. what color would the wire be? cheers

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  • Richard Scordino Oct 05, 2010

    have you considered that you may have it wired backwards?

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  • 41 Answers

Are you able to reverse the wires around?

Posted on Oct 06, 2010

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If the fuel sender wire from tank connects to full side terminal on guage...does power wire hook to empty side of guage?


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If you have a separate gauge, the power would go to + and the sending unit would go to - .

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Well friend, you know the dash gage is good cause that was a proper test procedure. Since your not getting proper readings it has to be the sending unit. Pull it apart and clean the rheostat with a pencil eracer and light pressure, the assemble it and try it again. if still nfg, replace the sending unit. they're cheap from any auto parts store.

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Fuel guage not working


Testing the fuel gage requires accessing the harness from the fuel pump and grounding the yellow / white wire with 160 ohms resistance this should cause the gage to read full, and with the circuit open you should have the gage reading empty. If the gage works in this order then the likely failure is the sending unit in the tank , and will require replacement.

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Gas gage read full when empty and sometimes emty


You have a bad fuel level sensor.The fuel tank needs to come out and the sensor replaced.You don`t have to replace the pump assembly.You can get the level sensor separate.I`m not sure if the parts stores have it but I know the dealerships do.Hope this helps.Good luck.

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Gmc jimmy 1999, fuel gauge reading empty, even


the sending unit in the tank has gone bad or a wire is grounded out.

Feb 06, 2010 | 1999 GMC Jimmy

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Gas gage always reads full untill i turn off car


the fuel sending unit is probably stuck and need to replacing. common problems to many older vehicle it tend to read sometime correctly and sometime not at all. the sending unit will be in your gas tank.

Sep 30, 2009 | 1991 Jeep Wrangler

2 Answers

I have a 94 chevy s10 and my gas reads empty while i drive.but when i shut off the truck the gauge moves to different readings.


Is......the problem--"the gas gage reads empty when there is fuel in the tank. OR, The gage moves when the key to turned off ?

If it's the first,
You will need to test the gage and through process of elimination, determin if the Sending unit inside the fuel tank has gone Bad.

If its the second ? - Electrical gauges will move when powered down. Normal

Testing the gauge may not be easy - just depends on your ability.
It is a simple 2-wire gauge circuit, when disconnect (usually need the fuel tank) the gage reads in one direction (either full or empty)
then when shorted-the gage reads in oppisite direction.

Of course you must select the correct wires or you may short out the wrong circuits!! Most GM vehicles use a purple wire & black wire.

A quick method I have used to check the in-take part of the gauge is this.
1st. know there is gas - 1/2 tank works best.
2nd driver's door open, key in run position, engine not running.
3rd gently lift up on the door then let if come back down, gently.
just enough to cause the gas to slosh around.
4th - keep an eye on the gas gage, a bad sending unit in the take will show up as a "twitchy" needle.

Of course, if the gage never leaves empty - sloshing won't work.
I have a known good sending unit I can plug into the vehicle and simulate different levels of fuel - if the gas gage works, I know the problem is in the tank.

Let us know.

Dave

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1 Answer

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I really doubt it is the fuel gage. You can test the gage by hooking a C cell battery to the wires from the tank. If it pegs the gage is good. You will need to go to Ford to get the sending unit. I doubt they will have this in stock, but they will order it for you. I would not even consider an aftermarket sending unit. Stick to the original Ford part. You will be happier with the results.

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I need to know if the other gauges are accurate. There is a voltage regulator mounted on the back side of the dash that can go bad and often does, that will make the other gauges inaccurate also.

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1 Answer

Fuel level gauge


some of this vehicles have a computer system, that will allow you to diagnose the fuel gage with an aftermarket sacan tool,
than most of auto repairs have, but i will recomend you to check also the conector by the fuel pump and make sure there is not any corosion or melting circuit inside the conector,

what the scan tool does is triger your gage and that way you will know if you have a bad gage.

May 17, 2008 | 2002 Ford Windstar Cargo

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