Question about 2004 Rover 25 2.0

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Rover 25 fault finding

Why does my rover 25 fuel gauge not return to the empty line when the ignition is turned off?

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It can air core gauge. It will always show what's in the tank

Posted on Jan 18, 2015

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I dropped the tank on my '99 Durango, installed a new fuel pump unit but the fuel gauge still shows empty. How do I troubleshoot?


The fuel gauge is directly controlled by the fuel sending unit inside the fuel tank, it sends a ground return signal back to the fuel gauge. I am assuming of course that your fuel gauge is okay. To test your fuel gauge, connect the wire which goes to the fuel sending unit to chassis ground. Your fuel gauge should respond and indicate Full Tank. If not, there is a broken wire somewhere between your fuel gauge and the sending unit. Before connecting the wire that goes to the sending unit to ground, check it first with a DC Voltmeter, you should be able to read +12volts. Be sure that you turn your ignition switch to it's ON position.

Apr 28, 2016 | Cars & Trucks

1 Answer

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

Fuel gauge registers full when ignition is switched on


Bad fuel sender unit or fuel sender wiring

Feb 03, 2013 | 1989 Jeep Wrangler

2 Answers

I have a 2003 GMC Envoy and my gas gauge has been flowing up and down to empty and full recently it has stayed on empty. How do I fix it?


Ensure that all of the wire connections are clean, secure and corrosion-free.

  • 2 Check your fuel gauge fuse if the gauge's indicator stays on empty when your turn on the ignition. If the fuse is good, join the sending unit connector to ground. Replace the sending unit if the gauge indictor moves to the full line.
  • 3 Ground the terminal located on the back of the fuel gauge with a jumper wire if the indicator doesn't move. If it does move, consider replacing the wire between the fuel gauge and the sending unit. A poor ground is frequently responsible for fuel gauge problems.
  • 4 Release the wire that connects to the fuel tank's sending unit. Confirm that there's no worn insulation that would permit wire contact to the body or frame. A fuel gauge reading of full generally indicates a problem with the tank unit, not the wiring.
  • Oct 18, 2011 | 2003 GMC Envoy

    2 Answers

    My van wont start anymore i believe its the fuel pump...but i dont want to buy another one if thats not the problem..what do i have to look at to find out if its the fuel pump or not?


    You should be able to hear the fuel pump, With the key in ignition turn to the ACC position do you hear a humming noise. If no then you need a fuel pump , If yes then youll need to troubleshoot other area of concern

    Apr 25, 2011 | 2000 Chevrolet Astro

    1 Answer

    Help with Range Rover 3.9 Fuel line problem Which fuel line supply and which is the return ? Marty


    the feed is the one connected to the fuel rail directly where the return hose connected to the fuel regulator which is d end of d rail

    Jun 10, 2010 | 1990 Land Rover Range Rover

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    My 2.5 range rover diesel wont start when cranking over diesel leeks from spill off return pipes tryed easy start no joy auto electrician said immobaliser wont let it start


    immobiliser also cuts starter motor so probably ok i would check the fuel pump is delivering enough fuel take off fuel filter put container under it and put ignition on you should get a strong flow

    Apr 28, 2010 | 2000 Land Rover Range Rover

    2 Answers

    Gas gauge reading empty even when tank is full


    Usually if the gas gage does not work yes it is true it may be the sensor if it is electronicly controlled. the sncor will more than likley be in the tank. here is how to remove your gas tank.

    1. Before servicing the vehicle, refer to the precautions section.
    2. Relieve fuel system pressure.
    3. Drain the fuel tank.
    4. Remove or disconnect the following:
      • Negative battery cable
      • Fuel filler and vent hoses
      • Fuel tank skid plate
      • Fuel tank wiring connectors
      • Fuel supply and return lines
      • Fuel tank
      • Fuel pump assembly
        7924bg17.gif Fuel pump assembly mounting
    To install:
    1. Install or connect the following:
      • Fuel pump assembly
      • Fuel tank. Tighten the bolts to 27 ft. lbs. (36 Nm).
      • Fuel supply and return lines
      • Fuel tank wiring connectors
      • Fuel tank skid plate
      • Fuel filler and vent hoses
      • Negative battery cable
    2. Start the engine and check for leaks.

    Apr 16, 2009 | 2002 Isuzu Axiom

    1 Answer

    Faulty fuel gauge. I turn on the ignition and the fuel gauge needle does not move. I stays below empty mark line even when I fill up the fuel tank to maximum. Please assist with your advice so that I...


    First thing I would check is for ground wire at the tank, where all the fuel lines & wires connect. There should be a ground to the sending unit, that might be bad or broken off. Quite often just a black wire with spade connector. If still there, clean both surfaces & re-attach, if broken off, replace connector, clean spade or whatever at tank & re-attach.

    Nov 27, 2008 | Mazda B2200 Cars & Trucks

    1 Answer

    Faulty speedometer


    you need a new speed sensor,very common fault for it to affect the fuel gauge,,,,,,,,,,,,,,,dont steam clean anything that involves electrics !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    Nov 07, 2008 | 2001 Volkswagen Golf

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