Question about 1989 Ford Bronco II

4 Answers

I just replaced my fuel pump and sending unit on my 1989 ford bronco ii the gas guage reads empty I have a full tank of gas I also installed a chip behind the instrument cluster that controls guage what else should I look for

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  • james o'dell Sep 02, 2010

    Just installed a new fuel pump and sending unit in my Ford Bronco II along with a chip that plugs into the back of instrament cluster the wire coming from sender test fine but the guage reads empty if I remove the chip from rear the guage goes past full what should I look for

  • james o'dell Sep 02, 2010

    the reading is fine on the meter coming from the sending unit all the way to dash plug what do you suggest it's a 1989 bronco II as I stated some one told me to replace the computer chip it cost $100.00 at ford with the chip out the guage goes past full with it in it goes to empty I've made sure the harness connectors were pluged it tightly still same results all I can figure is it has to be some where in the dash do you have any other suggestions

  • james o'dell Sep 02, 2010

    I purchased it from ford it looks liker a computer board about 1 1/2" square and slides into a slot just behind instrumenr cluster on left side behind gas guage Ford told me it controlled the gas guage and other things

  • james o'dell Sep 02, 2010

    I could take photo and send it to you of part and rear of cluster let me know

  • james o'dell Sep 02, 2010

    New fuel pump and sending unit installed new circut board installed in back of instrament cluster ohm meter shows working at the harness that plugs in back of cluster with the new circut board in the gas guage goes to empty with it out it goes past full could it be a ground problem what should I look for I'm really stumped I've never had this difficult of a problem.

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  • Master
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Did you make sure the sending unit float moved freely before placing it in the tank? Wires on correctly?

Posted on Sep 02, 2010

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  • Ford Master
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Hi.

The gauge reading full if you disconnect cable does not sound normal, at least if you use ford factory replacement. With no power the fuel gauge should go to zero.

Ensure that the problem is not caused by an incorrect installation of the sending unit. That is one of the most common occurrence.
Testing is done reading Ohms on contacts from sending unit contacts while emptying the gas tank (lift the truck and undo fuel line). This will tell if problem is sending unit, if Ohms stay the same, then sending unit is the problem.

Posted on Sep 02, 2010

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  • Ford Master
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What is this clip u replaced, has the gage been tested or replaced, are u sure the printed circuit is not defective on the back of the cluster? do u have a connection at the gage from the sending unit

Posted on Sep 02, 2010

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  • Master
  • 1,297 Answers

An open in the wire that runs from the sender all the way to the gas gauge

Posted on Sep 02, 2010

  • Sean Reisdorf
    Sean Reisdorf Sep 02, 2010

    what is this chip you installed and who makes the chip?

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1 Answer

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The ground wire is in the harness with the fuel pump and sending unit.
The sending unit in the tank grounds the gauge on the dash.

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The fuel pump is in the tank. Drop the gas tank.

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2. unbolt the gas tank straps
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The analog gas gauge is an electrical meter movement and while they rarely fail, they can. Most gauges in the last few decades do not return to 'E' with the power off, they just hang out wherever they happen to be when the ignition is turned off; yours isn't doing either.
The sender is a variable resistor that controls the current flowing through the meter and most (there are exceptions) will be at maximum current with a full tank of gasoline. When this is failing, normally the reading will at first be erratic (the wiper of the sender is losing contact intermittantly) then it will go to one or the other extreme, depending on how the sender is wired. To have one fail instantly is pretty rare.
Before replacing anything, I would check wiring and connection plugs to make sure it isn't a matter of corrosion causing one or the other lines to cease conducting. Since there isn't much current flowing here, a bad connection can cause it to quit conducting.
You should have the wiring diagram and a multimeter to check continuity.

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The sending unit in your tank is going bad replace it.

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1 Answer

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You don;t say whether the fuel gauge is reading accurately, or whether it's always on empty. If the gauge is always showing empty, it's most likely a problem with the sending unit in the fuel tank. Check the resistance across the two terminals of the sending unit.

On a C900, the fuel sender level unit is separate from the fuel pump and located on the right side top of the tank, accessible by removing the trunk floor lift up panel (the pump is located on the left side top of the tank.
Possible problems are: electrical line off or broken, float not working (it's fairly delicate); or gauge not working.

Test the resistance of the sending unit with the lines disconnected, the resistance should be 2.6 to 3.8 ohms full tank, 63.3 to 67.5 ohms empty tank; and test for voltage across the top of the sender unit, if no voltage, that's likely the problem!

If the gauge is otherwise reading accurately (showing 'full' for a full tank, etc) then the problem is likely a gauge malfunction and can be simply replaced.

Good luck!

Saabreur

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