Question about 1997 GMC Jimmy

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Fuel gauge does not work on empty..use to flicker when signals were turned on now it's just on empty...

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Sending unit. GM had issues with the sending unit which is in the gas tank...used about $100, new after market $150, new dealer $200 and about 1 hour labor

Posted on Jul 25, 2013

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See the diagram attached test the IC regulator and replace. God bless you
fuel gauge - fb4a610c-45f6-4074-a8bb-e13391d2f576.jpg

Posted on Jul 25, 2013

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Posted on Jan 02, 2017

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1 Answer

Renault master 2001,fuel light always on and fuel gauge always on empty regardless how much fuel I put in, the needle does flicker when I turn the engine on. presume its the fuel sensor, does any one have...


usually on top of gas tank wires going to it test by disconnecting wires ground a test lite and probing wires one by one and one will pulse glow this is the one you need to watch the gauge should start going up when probed

Sep 21, 2013 | Renault 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

2003 Chevy S10 had fuel pump replaced. When fuel gauge shows slightly below half, the gauge falls to empty and low fuel lights blinks. What could be causing this?


hi,

sounds like the sending unit rheostat(sending unit) has a bad contact or break in the resistance wire. inside the tank theres a float attached to an arm that goes to a small rheostat, like a volume control on a stereo. the rheostat is sending a scratchy signal or no signal to the computer and your getting these readings. that part is inside the gas tank, the part usually comes integrated with the fuel pump. the gas tank has to be lowered to fix it.

jm

Jul 04, 2017 | 2003 Chevrolet S-10

1 Answer

2001 chevy suburban fuel gauge stoped working


If the sending unit was connected and grounded, I would guess the gauge in the cluster is faulty.

Jul 09, 2012 | 2001 Chevrolet Suburban

1 Answer

1989 MB 190e: runs out of gas when fuel gauge shows not empty. Need to know the tank capacity so I'll know if it's the gauge or something else


You will need to replace the fuel level sensor, this involves the removal of the fuel tank to access the sending unit.

Jun 08, 2012 | Cars & Trucks

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

    1 Answer

    I just bought a 1961 Austin Healey Bug Eyed Sprite, in great condition, But, the fuel gauge doesn't work. How do I find out how to get it fixed>


    It could be a bad earth, this will make the fuel gauge either not work or work erractically.
    Fuel gauges on older cars are pretty basic.
    I'd be checking all my earth points, I'd also be looking at the fuel sender in the tank. It is possible that with all the work it has had, the wire has worn out. It is just a basic rheostat of a single piece of thin wire attached usually to a ceramic block at either pole. Most often this wears through and when that happens you will some times see either no gauge activity or it will work fine from empty to half but not beyond that. Also some times it works great from full to half then plummets to empty. Generally this is where it is worn.

    If your serious you could take your fuel sender and gauge to someone who can recondition instruments, and have them reco'ed as a set.

    Jul 31, 2011 | Aston Martin Vantage Cars & Trucks

    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

    I have a 94 chevy s10 and my gas reads empty while i drive.but when i shut off the truck the gauge moves to different readings.


    Is......the problem--"the gas gage reads empty when there is fuel in the tank. OR, The gage moves when the key to turned off ?

    If it's the first,
    You will need to test the gage and through process of elimination, determin if the Sending unit inside the fuel tank has gone Bad.

    If its the second ? - Electrical gauges will move when powered down. Normal

    Testing the gauge may not be easy - just depends on your ability.
    It is a simple 2-wire gauge circuit, when disconnect (usually need the fuel tank) the gage reads in one direction (either full or empty)
    then when shorted-the gage reads in oppisite direction.

    Of course you must select the correct wires or you may short out the wrong circuits!! Most GM vehicles use a purple wire & black wire.

    A quick method I have used to check the in-take part of the gauge is this.
    1st. know there is gas - 1/2 tank works best.
    2nd driver's door open, key in run position, engine not running.
    3rd gently lift up on the door then let if come back down, gently.
    just enough to cause the gas to slosh around.
    4th - keep an eye on the gas gage, a bad sending unit in the take will show up as a "twitchy" needle.

    Of course, if the gage never leaves empty - sloshing won't work.
    I have a known good sending unit I can plug into the vehicle and simulate different levels of fuel - if the gas gage works, I know the problem is in the tank.

    Let us know.

    Dave

    Feb 28, 2009 | 1996 GMC Sonoma

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