Question about 1996 Subaru Legacy

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Fuel gauge slowly reacting to changes in fuel levels

My fuel gauge reacts very slowly, if at all, to varying gas levels. Gauge won't go above a half tank on a full tank of gas. Is it my fuel sensor? How do I replace it?

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  • 324 Answers

It will be your float in your tank, you have to drop the tank and replace the float.

Posted on Nov 26, 2008

  • patmecano Oct 21, 2010

    you have a accest port in the trunck for the gadge .no need to drop the tank

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If the speedometer works but the tach doesn't, I think something is wrong with instrument cluster?
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It may be possible to use different size resistors in place of the fuel level sending unit, to see if fuel gage reacts properly to different resistors, if the gage reacts properly, then I think the problem is the fuel gage sending unit.

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What causes the fuel gauge to read only half tank


My friend on your attempt to renew the fuel pump which actually is connected with the fuel gauge you either damage the leveling gauge either by bending it or scratched it to a place where the gauge shows half tank. It is better to remove again and very slowly and carefully check for any slight faults.
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I have a 1992 Mercury Grand Marquis Ls with a fuel gauge that does not work (gauge may be reversed)??? help please.


The fuel level indicating system is a magnetic type system, which consists of the sending unit located in the fuel tank, an anti-slosh module located on the back of the instrument cluster, and a fuel gauge located in the instrument cluster. The sending unit changes resistance according to the level of fuel in the fuel tank, which varies the current flow through the gauge.The pointer position varies proportionately to the current flow. In this system, the sending unit resistance is low (22 ohms) when the fuel level is low and high( 145 ohms) when the fuel level is high. The pointer of the magnetic gauge remains in position when the ignition is turned to the Off position. On some models, an anti-slosh module is used to dampen out fluctuating fuel signals from the sender. Some vehicles are equipped with a low fuel warning indicator. The anti-slosh module will also actuate the low fuel indicator when the fuel level in the tank reaches 1/16 to 1/8 full.


Do your other gauges/warning indicators work properly with the ignition on? If not, check for power at the fuse panel/fuses.

If they do then partially remove your cluster with connector still installed and check for voltage at cluster connector and gauge. Check continuity of cluster and gauge for ground.

Sometimes the anti-slosh module (if installed) goes bad in the Grand Marquis but not likely.

Sender troubleshooting:
  1. Perform test with resistors as follows:
    1. Disconnect wiring connector at sender unit, then connect resistor between gauge lead and a suitable ground.
    2. Turn ignition switch to On position.
    3. With 145 ohm resistor, the gauge pointer should contact the Full mark.
    4. With 22 ohm resistor, the gauge pointer should contact the Empty mark.
  1. Perform test with fuel sender of known quality as follows:
    1. Turn ignition to Off position.
    2. Disconnect wiring connector from sender and connect it to test sender.
    3. Move float rod away from fuel filter against Full stop position. Wait approximately 30 seconds, then turn ignition switch to On position. The gauge should read on or above the Full mark.
    4. Move float rod toward fuel filter against Empty stop position. Turn ignition switch to Off position. Wait approximately 30 seconds, then turn ignition switch to On position. The gauge should read on or below the Empty mark. If gauge works properly replace sender, which involves dropping fuel tank.

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Fuel gauge not working


first you need to bring out the floater in the tanks and move it manuali with the switch on and see if the dash reacts if not with a multimeter mesure the oms in the sender circuit and find if there is any change in the uper half of its travel then you can now if the sensor or the indicator ar faulty

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This sounds like the fuel level sensor in the gas tank is going bad, or there is a bad ground at the tank. A technician using a scan tool can monitor the actual fuel level data to verify.
Another possibility is a bad stepper motor in the instrument panel, each gauge had a stepper motor to drive the needle.

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