Question about Chevrolet 3500

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Gas gauge out of range

Gas gauge has gone to very high indication dropping to a minimum of about 3/4 full.
Other gauges are normal.
I think could trace the problem if I knew the correct resistance range of the sender.

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  • wyoham Aug 22, 2008

    I'm not anxious to replace a $300 instrument cluster if it's the sender!

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Technical help is much advisable.

Posted on Aug 22, 2008

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How to determine right sender for gauges
http://groups.google.com.ph/group/rec.autos.makers.vw.aircooled/browse_thread/thread/926d54521f4bbeaf/13e5dbe97ac10648?hl=tl&lnk=st&q=resistance+range+of+the+sender+fuel+gauge#13e5dbe97ac10648

Posted on Aug 22, 2008

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You need someone with a digital multimeter to measure the resistance of pins 2 and 3 on the fuel pump (not on the wiring harness, but the pump itself , these pins are connected to the sender coil) and let me know what the gas gauge reading is that corresponds with this resistance. Measurements with a full tank and a close-to-empty tank would be perfect.

Hope that helps.........

Posted on Aug 22, 2008

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Check the gas pressure transducer, its malfunctionting not always but randomly ..

regards,

Posted on Aug 22, 2008

  • SALMAN NASEER Aug 22, 2008

    moreover, check the gas guage needle, is it properly fixed with internal bordon tube of guage or free..



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Your fuel level sensor in the tank is going out when it hits worn spot it will flop gauge around this part is available seperate from fuel pump assembly. I find it easier to take bed loose than drop tank

Posted on Aug 22, 2008

  • TripleTauto
    TripleTauto Aug 23, 2008

    This is a common problem on these trucks it goes crazy at certain fuel levels? or when you stop at light will bounce to empty then full.? this is fuel level sensor what year truck?

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Most possible it's level sensor doesnt move up-down according gas level. Remove inspect and repair or replace if necessary.

Posted on Aug 22, 2008

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The gauge sensor or fuel level sensor needs to be replaced. Sometimes, it only needs adjustment. But the sensor itself cannot be repaired.

Helpful link for Liquid Level Control using Pressure Sensor

http://www.freescale.com/files/sensors/doc/app_note/AN1516.pdf

Posted on Aug 22, 2008

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When you get this , usually you have to replace the gas gauge instrument.

Posted on Aug 22, 2008

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  • Ginko
    Ginko Aug 22, 2008

    Check also the sensor in the gas tank, when it is faulty it can return wrong voltage.

  • Ginko
    Ginko Aug 22, 2008

    sometimes this also happens because the float arm is getting hung up on the rear fuel tank filler opening pipe, check this out before proceeding on electronics.

  • Ginko
    Ginko Aug 22, 2008

    Here is how to test the fuel sender:

    "The most likely cause of your problem is fuel sender inside the fuel tank, this is a sliding contact with a float
    attached and the contact wears causing an open in the circuit. To
    test for this before replacement, disconnect the connector at the top
    of the fuel tank module ( this is the 4" round white part on the top of
    the fuel tank) there are 2 connectors here one is square and the other
    flat, the square is the connector that is disconnected, with the
    connector disconnected turn key to run and observe guage. Normal result
    is the gauge cycling to past Full, then connect a jumper
    wire across the purple and orange wire, the gauge should cycle to past
    empty. If the results are normal then the sender is at fault. If the
    results are abnormal then the problem is with the wiring or gauge
    inside the cluster."
    thanks Chevrolet Auto Repair Information


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Better replace it.

Posted on Aug 22, 2008

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1 Answer

My polo 1.4 se's fuel gauge has sat on 3 quarters for 3 days now, not normal with the amount of driving I do daily, what could be causing the problem? It changes a bit when on a slope though


Hi Josh:
I'd start by completely filling the fuel tank.
Since you know how far you usually can go on a full tank, when you have gone about alf that distance, the gauge should show about half a tank, and when you've gone just over 3/4 of that distance, the gauge should be starting to show on the low side.
At least, if you know that the gauge is not reading correctly, you won't run out of gas if you keep track of the distance and always fill the tank completely.
Hope this helps.

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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.

Mar 23, 2013 | 1992 Mercury Grand Marquis

1 Answer

Jetta 2 CSX 1988 model. Temperature gauge indicate normal but from time to time drop to the off position just to wake up some time later. Allready replaced the sensor on the engine without any luck.


I would not have replaced the sensor, but replaced the temp gauge assembly itself..........normally a temp sensor does not "drop out" but is either full defelction or off........., or alternatively can sometimes misread......but the dropping out is unfortunately due to the gauge being faulty.........!!

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"Check your gauges" light come on when I come to a


you are low on oil in the engine- brake hard and watch the pressure gauge it will drop also---you are at least 3 qt's low.

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1 Answer

The gas gauge says full when you start the engine and the electric range says 446 miles to empty then it will all drop to empty and the gas light will come on, so i never know for sure how much gas I have.


Sending unit gas gauge in the gas tank has gone bad and will need to be replaced. The gas gauge wire is grounding out causing you to have full full indicated and when there is no ground you get empty signal.

This is caused by the gauge in the tank having a bad spot on the float, which is common from wear and tear. Also if your lucky, it may just be the wire harness from the gas tank to the frame might be the issue and will need to be replaced. It worst, it's going to be the sending unit it self.

Thank you for using fixya and good luck

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Just bought a one owner 1991 Saturn SC - great condition. Need assistance with problem - fuel guage only goes down to 1/2 tank and then car is out of gas. If we put 6.5 gal of gas in, guage is back to full...


Well I would think that the tank's sender unit, or the gauge is bad. As the tank has to be dropped to get at the sender, your easiest bet is the gauge. Look on ebay, most likely have to get the whole cluster, for a few bucks. Look on youtube for instructions about getting the cluster out.

If you are a real geek, you could find the sender's resistance values, find a similar variable resistor at radio shack and use that to fool the gauge. See if the gauge sweeps across the whole range of its motion. If the gauge works fine then it is drop the tank time, get a new fuel pump while you are in there on a car that old. You could well find that someone else has beaten you to the new pump and reinstalled it with something wrong with the range of motion on the sensor.

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2 Answers

Po463 fuel level sensor circuit voltage too high. how to fix?


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2006 Chevy Trailblazer fuel gauge stays on empty


Could be a
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Vehicle is not that old, would think it is still under warranty?

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Virbration? That is a different story. Oil won't cause that.

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