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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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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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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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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1 Answer

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