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My gas hand fluctuates between full and empty no matter how much gas it has in the tank. what could cause that?

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  • Cars & Trucks Master
  • 14,585 Answers

A bad sending unit in the tank. Look online , you can get them for around $20.

Posted on Dec 06, 2014

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Posted on Jan 02, 2017

CMV9
  • 594 Answers

SOURCE: gas gauge reading empty even when tank is full

Usually if the gas gage does not work yes it is true it may be the sensor if it is electronicly controlled. the sncor will more than likley be in the tank. here is how to remove your gas tank.

  1. Before servicing the vehicle, refer to the precautions section.
  2. Relieve fuel system pressure.
  3. Drain the fuel tank.
  4. Remove or disconnect the following:
    • Negative battery cable
    • Fuel filler and vent hoses
    • Fuel tank skid plate
    • Fuel tank wiring connectors
    • Fuel supply and return lines
    • Fuel tank
    • Fuel pump assembly
      7924bg17.gif Fuel pump assembly mounting
To install:
  1. Install or connect the following:
    • Fuel pump assembly
    • Fuel tank. Tighten the bolts to 27 ft. lbs. (36 Nm).
    • Fuel supply and return lines
    • Fuel tank wiring connectors
    • Fuel tank skid plate
    • Fuel filler and vent hoses
    • Negative battery cable
  2. Start the engine and check for leaks.

Posted on Apr 16, 2009

  • 401 Answers

SOURCE: 2004 chevy malibu; gas hand moves from empty to full then back to empty

Hi the gas gauge is erractic
you need to replace the fuel level sensor

Posted on May 05, 2009

localwonder
  • 6784 Answers

SOURCE: Having problems with the fuel guage on 2002 Buick

Hi, your fuel pump is fine, its the sending unit(module). its located inside the fuel tank. its part of the fuel pump assembly and, you will need to replace this device. Its malfunctioning at this time.

Please rate and god bless:)

Posted on May 09, 2009

  • 401 Answers

SOURCE: my 2002 monte carlo`s fuel gauge fluctuates from full to empty

Hi you need a fuel level sensor

Posted on May 13, 2009

  • 79 Answers

SOURCE: gas gauge flucuates to empty and full so we never know if we have enough gas. What to do?

It is a common problem. It is a faulty in tank sender. You can just replace the sending unit by removing tank.

Posted on May 18, 2009

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1 Answer

Fuel gauge always reads full even when empty also needle fluctuate back and forth.


fuel tank sending unit(Float), in gas tank, broken wire sticking or loose on bracket, best to replace since tank will have to be removed to fix in any case. they are about $40.00

Jan 20, 2016 | 1977 Buick Electra

1 Answer

Gas hand fluctuates


Most likely the fuel level sendor in the tank. It is attached to the fuel pump assembly. I would reccomend replacing the fuel pump with sender and fuel filter. Since you have to drop the tank might as well replace everything while u are there

Apr 02, 2015 | 2002 Chevrolet Impala

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Why fuel gauge not working gas guage on 2009 santa fe stays on empty even with a full tank of gas. Guage fluctuates from empty to 3/4 full to empty to 1/3 full at any given time.


It could be the sending unit in the tank or the gauge on the dash. A mechanic would test the signal coming from the sending unit to verify.

Jan 19, 2014 | 2009 Hyundai Santa Fe

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Dash gas gauge stops showing proper gas level once it hits half a tank. Then gauge will fluctuate between empty (light will come on), full and anywhere in between but seems fine from full tank to half


If the trouble with the gauge started after you worked on it then you likely damaged or created a restriction to the movement of the sending unit. You will have to remove the tank and double-check your work.

Mar 01, 2013 | 2000 Buick LeSabre

1 Answer

Gas gage


This problem is caused by a defective fuel level sending unit inside the gas tank. You must remove the fuel tank in the model to access the fuel level sending unit. You will need a hydraulic floor jack and common hand tools to drop the tank out of the car.

Mar 22, 2012 | Cars & Trucks

1 Answer

Gas gauge fluctuating all the time


i would say its the gauge sender,but the problem is its inside the fuel tank,so it looks like a job for the garage.adrian,,,,,,

Jun 30, 2010 | 2002 Saab 9-5

1 Answer

Gas gauge flucuates to empty and full so we never know if we have enough gas. What to do?


It is a common problem. It is a faulty in tank sender. You can just replace the sending unit by removing tank.

May 18, 2009 | 2000 GMC Yukon Denali

2 Answers

2004 chevy malibu; gas hand moves from empty to full then back to empty


Hi the gas gauge is erractic
you need to replace the fuel level sensor

May 05, 2009 | Chevrolet Malibu Cars & Trucks

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