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Where is the wiring for grounding the fuel gauge

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GROUND WIRE IS A BLACK WIRE THAT GOES WITH WIRES GOING TO THE FUEL PUMP ASSEMBLY IN FUEL TANK.

Posted on Sep 29, 2010

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Do I need to take out and and then reinsert the fuel pump fuse to reset the fuel gauge


That won't affect the fuel gauge. Different circuits, entirely. Any issue with the fuel gauge is between the gauge on the dash, a little wiring to the gas tank, and the sender unit inside the tank. In most cases, the problem turns out to be the sending unit inside the tank.

To check the gauge itself for working, you can ground the fuel gauge wire at the gas tank connector, and watch for movement on the gauge, with the key in ON. You take the connector off at the gas tank, find the wire for the fuel level sender (or gauge), and touch it to a good ground- a metal piece on the car frame. If gauge is good, the needle will move either to full or to empty, but you can see the needle move to a new point, when you (temporarily, only temporarily) ground the fuel gauge wire. The key in the switch must be in on. If this causes the needle to move, then the dash gauge is good, and the problem is the sender unit in the tank. This unit has a variable resistor, not too expensive. The fun is getting to it.

Nov 30, 2016 | 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

2005 Jeep Liberty won't start, fuel pump won't run, fuel tank is full but gauge reads empty. Suspect ground wire as it is common to both but can't find ground connection


Just take any wire and hook it up to car ground - then take the other end of wire and hook it up to the ground side of fuel pump. If the pump and gauge have a common ground as you say, this should restore operation to both units. If gauge still does not work then it does not have a common ground with the pump and needs its own ground.

Aug 19, 2015 | Jeep Cars & Trucks

1 Answer

What's your question?fuel pump working but gauge nt working wts can be the cause.


Either the gauge itself, or the wire from gauge to tank, or the sending unit in the tank. Most of the time it is a problem with the sending unit.

They work like this: in the instrument cluster, a small voltage regulator sends low voltage through the gauge, into the wire to tank, and to the sending unit. The unit has a variable resistor that varies according to the fuel level, measured by the float arm attached to the unit. What it (the gauge) actually measures is resistance to ground-the current goes to a ground point after going through the variable resistor in the sending unit.

You can check if problem is the gauge or the sending unit by grounding the fuel gauge wire at the gas tank connector. Pull the electrical connector apart and locate the fuel gauge wire. Jumper that wire to ground on the frame while watching the fuel gauge needle for movement. DO NOT ground it for more than a split second, just touch to ground while someone watches the gauge. If the gauge needle moves at all (will probably go to full or empty), then the problem is the sending unit in the tank. The gauge is good, so is the wire from gauge to tank. I should mention that doing this test can possibly blow the meter (gauges) fuse in the fuse panel- why I said to do it just for a brief moment.

Jun 29, 2015 | Cars & Trucks

2 Answers

Gas gauge won't work and it has a full tank of gas. Is there a fuse I can change.


There might be but it is unlikely a fuel gauge is fused alone; usually if it is a fuse other things will stop working too but I suggest you are guided in this matter by your car handbook.

Problem is probably wiring and in particular the grounding of the fuel tank sender unit. It could be a faulty sender but they are usually quite reliable.

Test by disconnecting the wire from the sender unit at the fuel tank and short to a good ground and the gauge should read full. If the gauge wire is in a block with other wires it will be necessary to positively identify the gauge wire before testing.
If the gauge reads refit the wire and duplicate the ground wire to a known good ground. If the gauge still reads the fault is a bad ground to the tank sender unit and if it doesn't the sender unit itself is probably faulty.

If grounding the gauge wire does not produce a reading the fault is the wiring to the tank, the supply to the gauge or a problem with the gauge itself.

Feb 06, 2015 | Cars & Trucks

2 Answers

How do i know i have a bad float in dual tanks?


Of readings are inconsistent with known fuel levels, Ground (or connect to a tester light) the sender unit wire and watch if the gauge rises.

May 20, 2014 | 1985 Ford F150

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

    My 97 S-10 Blazer fuel guage wont work


    Likely, it's the sender unit in the tank. To check wiring and your dash gauge, you can pull apart the connector at the fuel tank, find the wire for the gauge sender unit (its color coded-I dont kinow what the one for your car would be), and on the harness side(the one going to front of vehicle) use a jumper wire and ground that wire to the car frame(get me? you want to ground the wire going to your dash gauge)-with key on, your gauge working properly will move up to half-way or even full. That tells you your dash gauge is working and your wiring to gauge is good. If gauge doesn't move when grounded(double check for a good ground), then your dash gauge may be bad.

    Oct 12, 2011 | 1997 Chevrolet Blazer

    1 Answer

    Gas gauge on park ave 1999 does not give accurate reading. Jumps around. Can it be done without dropping tank.


    Buick dealers have a diagnostic box that checks gauge sweep and range, an 0-100 Ohm variable potentiometer with key on can check this gauge however you must tap into the wire going for the sending unit at the tank. With a voltage meter check the four wire connection (only one)connector going to the top of the tank, find a good ground and check for voltage one will be 12 volts with KEY ON ENGINE OFF look for a 12 volt reading for 5 seconds and then it will stop this is for priming fuel rail and is to fuel pump, you want the ground side of the gauge the other two will be grounds, fuel pump and gauge. The grounds may be near the wiring harness going to the frame. In either case they will be grounds you are looking for the one that is not either ground or power, most likely it will be either a flashing light or very low voltage. Attach the pot to the gauge wire and have someone watch the fuel gauge if it is erratic the gauge is the problem. If the gauge sweeps slow and steady the problem is in the sending until in the tank. AND HAS TO BE DROPPED! Run the tank down on fuel as low as you dare and drop tank. Be carefull working with fuel can be very DANGEROUS if you are not experienced working around fuel DON'T Attempt!

    Oct 13, 2010 | 1999 Buick Park Avenue

    1 Answer

    Fuel level sensor ground crossed with fuel pump ground on a 98 chevy truck. what color are these ground wires?


    i think the ground wire going to the gauge is black/white stripe and solid black is pump ground the bigger gauge wires r pump wires and the smaller gauge wires go to the fuel guage

    Mar 16, 2010 | 1998 Chevrolet C1500

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