Question about Mazda B2200

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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 can trace to fault and repair if within my ability or refer to workshop.

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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.

Posted on Nov 27, 2008

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Posted on Jan 02, 2017

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Why does my gas gauge needle never go below 3-4 tank?


I would guess the fuel level sending unit is malfunctioning, deposits sometimes build up on the resistor pack, or there is and open circuit in the resister pack, does the fuel gauge needle do a full sweep from empty to full and back when the ignition key is turn to the run position? This is a cluster self check mode, if it fully sweeps than the cluster is ok, I would suspect it needs a fuel level sending unit which is located in the fuel tank as part of the fuel pump modual but usually can be serviced separately

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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.

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Sender troubleshooting:
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    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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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.
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