Question about 2000 Ford Mustang

2 Answers

Fuel gauge stuck on full

Installed new ground from tank to frame no change, when i remove pos lead gauge stays at full , when i touch pos lead to ground gauge goes to empty. any suggestions!

Posted by on

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 353 Answers

The fuel sending unit in the tank is broken. It acts as a variable resistor that tells your gauge what level the tank is at. When you remove the pos. lead it shows infinite ohms. and when you short it to ground it shows 0 ohms.

Posted on Jul 28, 2009

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 372 Answers

Pos lead is used to measure ground...that means that the power goes through the fuel level sending unit and the ground lowers the power out from the unit....I would replace the fuel level sending unit.

Posted on Jul 28, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

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

1 Answer

I HAVE A 1999 PONTIAC GRAM AM WHEN I START THE THE CAR THE FUEL HAQND GOES TO FULL THEN DROPS TO EMPTY AN STAYS THERE AN I NO FUEL IS IN IT


It has to be the sender unit in the tank, or the gauge in the dash, or the wiring between them. In most cases, it is the sending unit-they are quite fragile often. Usually best to replace them (not very expensive-just difficult to get to.) The sending unit will be located with the fuel pump inside the tank. They are removed as one single unit.
There is a way to test if the dash gauge itself is working properly. You have to find the wire going into the fuel tank that is from the gauge, then with key on, ground that wire to the frame-you can use a jumper wire into the fuel tank electrical connector. When the wire is grounded, the gauge will definitely move to one place (either half full, or full-but it moves and stays there). If you see that, you know the sending unit in the gas tank is bad. Do not ground that wire for more than a couple of seconds, it is lo0w voltage, but it may cause a shorting problem.

Oct 07, 2016 | 1999 Pontiac Grand Am GT

2 Answers

My gas hand is going a little crazy, it will go to full and stay a while then move to empty, and I just put a new fuel pump and sender in it, what should I do now ?


I can only think of two possibilities:
1) The Ground Wire (goes from the sending unit in the fuel tank to the frame of the car) is not getting a good connection or
2) The fuel gauge in the dashboard is bad.

If your description means that the change in the gas gauge is random then check the ground wire. If you have a volt-ohm meter, try checking the resistance from the wire where it attaches to the sending unit, negative side. Remove wire from sending unit first. Make sure negative wire on V_O meter is connected to frame of car. Reading should be almost zero. Anything else and the wire you are testing does not have a good connection.
If your description means that you turn the car on and the gas gauge is reading full for awhile and then goes to empty, the gas gauge is bad.

Sep 29, 2012 | 2002 Pontiac Bonneville

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

    Fuel guage was erratic then went past full mechanic installed a new pump and sending unit now it stayed at 1/4 tank and when I filled it itwent below empty. bad sending unit or bad guage or bad mechanic?


    Test the gauge by using a test light ,and grounding the test light clip to a good known ground,then touch the pink wire on the connector harness going to the tank,with the connector unplugged,and key on,the gauge will move slowly to the empty mark,and lower ,then remove the test light and it will go past full,if it does this,it is a good gauge,and the sending unit,was put in wrong,or the part was bad.

    Apr 28, 2010 | 1997 Chevrolet Blazer

    2 Answers

    I recently asked about a fuel gauge that is reading full all the time on a silverado 1500 5.7L tbi. when i disconnect the fuel pump harness, the gauge goes further past full. i noticed the ground from the...


    Absolutely, your gauge works off of resistance that is calibrated, if you have a rusty or bad ground you are causing more resistance, hence a full reading. Disconnecting it puts it to its default setting which is full, All the resistance in the unclean ground is tricking your sender in to thinking tank is full...

    Sep 12, 2009 | Chevrolet Silverado 1500 Cars & Trucks

    1 Answer

    1992 f 159 dual tanks fuel guage not working


    You will need to remove the wire for the sending unit on the tank and ground it to the frame with your selector switched to the tank you are working on and the key on. If gauge comes up to full then the sending unit is bad and gauge is good. Repeat process on other tank. The fuel tank switching valve on the frame also switches the wiring signal from either tank for the gauge. If no change with first test you will want to check the valve.

    Aug 13, 2009 | 1992 Ford F150 SuperCab

    1 Answer

    Fuel gauge bottomed out and a ground wire was burnt should i try a new gauge and ground to frame


    Fix the groung wire. Jack up the vehicle and put on jack stands before going underneath. If you can get to the electrical on the tank or just before it and disconnect, clip a test light to a good ground and touch each pin and see if the inside gauge move to full. If it does, make sure there is ground to the connector also. Then you can change the gauge if all test akay.

    Jun 11, 2009 | 2003 Hummer H2

    1 Answer

    Gas gauge works intermittently-1996 Hyundai Accent


    Two things here.Its either theres a bad ground from the tank to the frame or the fuel sending unit in the tank is not working properly...Give all the ground wires from the fuel pump harness up to the motor..Make sure not corroded.If all the wires are good than its the fuel sender in the tank..Hope this helps you find your problem and have a great day...

    Apr 02, 2009 | 2001 Chevrolet Blazer

    1 Answer

    Gas gauge reads past full all the time


    have seen this & fixed siml. cond.. sorry, but float got stuck at top pos.had to drop tank & replace.but have heard that sometimes a hard jolt can free.

    Jan 06, 2009 | 1992 Ford Ranger

    Not finding what you are looking for?
    2000 Ford Mustang Logo

    445 people viewed this question

    Ask a Question

    Usually answered in minutes!

    Top Ford Experts

    yadayada
    yadayada

    Level 3 Expert

    75817 Answers

    Colin Stickland
    Colin Stickland

    Level 3 Expert

    22156 Answers

    fordexpert

    Level 3 Expert

    5495 Answers

    Are you a Ford Expert? Answer questions, earn points and help others

    Answer questions

    Manuals & User Guides

    Loading...