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Fuel gauge wiring

When ignition is turned on fuel gauge goes to full.when i turn lights on gauge reads empty? aftermarket gauge.

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Posted on Jan 02, 2017

  • 67 Answers

SOURCE: check gauges light

Possible bad guage, bad wiring, or bad sending unit. Check each one independently of each other, start with wiring first, then sending unit.

Posted on Aug 27, 2008

  • 135 Answers

SOURCE: My 2000 Chevy Impala fuel gauge reads empty.

sending unit on fuel pump is bad, the sending unit shorts out gauge will go to empty or full, never read right, turn on switch ,it goes to full or empty, ,check the pump,hope this helps,thanks robert b.

Posted on Jun 28, 2009

  • 497 Answers

SOURCE: 2002 Chevy Suburban: Fuel gauge reads empty, tank is half full

Youre gauge is controlled by a plunger in the fuel tank which is attached to the sensor and the fuel gauge. it sounds like when the plunger goes down half way its either getting stuck down lower then it should. Needs replacing. Any mechanic can do this install for you.

Posted on Aug 27, 2009

  • 1 Answer

SOURCE: 2006 Chevy Trailblazer fuel gauge stays on empty

It requires a new fuel tank sensor that is $600 for the part.

Posted on Aug 28, 2009

  • 58 Answers

SOURCE: '01 chevy venture fuel gauge doesnt read correctly reads all over

fuel sending unit located on the fuel pump in gas tank

Posted on Jan 13, 2010

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On a 99 grand am the gas gauge allways reads empty what is the color is the ground wire for the gas gauge


It's not the ground wire , the gauge grounds inside the instrument cluster .Your sending unit or the gauge it's self is bad .
Body Control System Operation
The Body Control Module (BCM) performs the following functions:
?€¢
Gauge control


?€¢
Instrument cluster indicator control


?€¢
Fuel gauge control


?€¢
Temperature gauge control


?€¢
Theft deterrent


?€¢
A/C compressor request


?€¢
A/C cooling fan


?€¢
Exterior and interior lighting control for the following lamps:


-
Daytime Running Lights (DRL)


-
Automatic lighting control


-
Fog lamps


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Interior lighting


?€¢
Battery rundown


?€¢
Chime


Gauge Control
The Body Control Module (BCM) receives Class 2 serial data messages from the Powertrain Control Module (PCM) to determine the following gauge information:
?€¢
Engine coolant temperature


?€¢
Fuel level sensing


Your best bet is to take your vehicle to a qualified repair shop !
Fuel Gage Inaccurate or Inoperative

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Select the PCM display DTCs function on the scan tool.
Does the scan tool display any DTCs?
--
YES - Go to Diagnostic Trouble Code (DTC) List (2.4L) or Diagnostic Trouble Code (DTC) List (3.4L) in Engine Controls
NO - Go to Step 3

3

With the scan tool, select Instrument Panel Cluster, Special Functions and command the fuel gauge UP.
Does the fuel gauge complete a full sweep when commanded?
--
YES - Go to Step 4
NO - Go to Step 12
  1. Turn OFF the ignition.
  2. Disconnect the fuel level sender.
  3. Connect the J 33431-C Signal Generator and Instrument Panel Tester between the signal circuit of the fuel level sender and the ground circuit of the fuel level sender.
  4. Turn ON the ignition, with the engine OFF.
  5. Important: Verify the J 33431-C resistance setting with a DMM.
  6. Set the resistance on the J 33431-C to 40 ohms.
Does the fuel gauge display at or below empty?
--
YES - Go to Step 5
NO - Go to Step 6

Jul 28, 2016 | Pontiac Grand Am Cars & Trucks

2 Answers

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

    3 Answers

    All other gauges work on the hyundai but the fuel gauge wont work shows empty all the time how can i fix this problem


    Turn the ignition on and off several times before inspecting the gas tank because a blown fuse is the usual cause for fuel gauge malfunctioning. If the gauge remains motionless, check your fuse box and determine the fuse's location using your service manual.
    Replace the fuse if the link is broken or damaged. Then, inspect the gauge's wire connections for cleanliness and make sure the wires are connected.
    Turn the ignition switch to the "off" position. Attach one end of a jumper cable to the fuel-gauge terminal behind the gauge itself. Attach the other end to the ignition terminal.
    Replace the sender unit in the gas tank if the gauge reads full and your car does not have a full tank. Replace the fuel gauge if the needle remains inoperative.


    Jun 12, 2011 | 1994 Hyundai Sonata

    2 Answers

    The fuel gauge is'nt working.I tryed to ground it


    When testing a fuel guage you should disconnect the wires to it,guage should read over full,ground the float wire,turn off key then turn back on should read empty.You have to cycle the key for guage to move.If still inop the wire is broken in the harness between the tank and the dash.Voltage on the float wire is low.When tested with a test light it will barely light the light and pulsate.This test indicates the wiring is good.

    Apr 17, 2010 | 1991 Chevrolet C1500

    2 Answers

    Fuel Gauge


    Most of the time it is the Sending unit in the tank

    Dec 27, 2009 | 2000 Kia Sportage

    2 Answers

    My 2000 Chevy Impala fuel gauge reads empty.


    sending unit on fuel pump is bad, the sending unit shorts out gauge will go to empty or full, never read right, turn on switch ,it goes to full or empty, ,check the pump,hope this helps,thanks robert b.

    Jun 27, 2009 | 2000 Chevrolet Impala

    1 Answer

    Check gauges light


    Possible bad guage, bad wiring, or bad sending unit. Check each one independently of each other, start with wiring first, then sending unit.

    Jun 30, 2008 | 2005 Pontiac Sunfire

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