Question about 1999 GMC Sierra

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My fuel gauge indicates empty after filling the fuel tank. By the time it is down to about 3/4 full, it indicates normally from then on.

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  • Anonymous May 15, 2009

    FUEL GAUGE FLUXUATES BETWEEN FULL AND EMPTY WHEN ITS FULL. SEEMS TO WORK BETTER AS THE FUEL LEVEL DECREASES.

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On most vehicles you can only place the max amount of fuel in the vehicle to the point the fuel nozzle shuts off.when you put more into it it causes a temp.flux in the floater causing it to go to the bottom until there is air back in the tank. the floater has to have so much air to float. sort of like your lungs when you exhale all the air your lungs will collapse.

Posted on May 31, 2009

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My 1999 GMC Sierra did the same thing. Fuel pump went out shortly thereafter.

Posted on May 18, 2009

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Posted on Jan 02, 2017

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1 Answer

Why would Fuel gauge fluctuate erratically then shake at blinding speed?


Bad sending unit, bad ground, bad gauge, I have seen sending unit go bad they will work part way.

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How to adjust gas gauge to read right not reading way over filled like it does now. When 1997 chev 350 vortec truck gauge is at 1 st red mark close to empty, better not past gas station ! ! !


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but its very hard on the "sender" as for level indicator full to empty, think of the shape of the tank narrow at top to widest point in the middle (full to half) wide middle to narrow bottom( half to empty)

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Town and Country Van running out of gas and guage says half a tank what could be the problem?


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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.


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Fuel gauge problem


Could be either one.
You could disconnect the harness at the tank and ground the gauge circuit to see if the gauge will go to full. If it does chances are the problem is the sending unit in the tank.

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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.
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    The fuel gauge slowly goes down to indicate that my tank is empty, but it is not.


    Sound like the float has a hole in it and fills with fuel when the tank fills up, you will have ti remove the gas tank and check the float, most of the time you can replace the unit as one.

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    When I fill my gas tank on my 2000 Dodge intrepid, the fuel gauge will move from full, drop to empty and then back to full again. It does this over and over until the tank is down to about 3/4 full.


    HI, the fuel gauge sending unit is malfunctioning. this is located inside the fuel tank and, it is part of the fuel pump assembly. replacing this failing component will fix this issue.

    Jun 19, 2009 | Dodge Magnum Cars & Trucks

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    Fuel gauge not working all the time.


    This is a normal concern.
    The instrument cluster uses 4 different operating modes to calculate the fuel level:
    Anti-slosh (default mode)
    Key OFF fueling
    Key ON fueling
    Recovery
    After a fuel fill up, the time for the fuel gauge to move from empty (E) to full (F) ranges from 2 seconds to 55 minutes depending on which operating mode the fuel gauge is in.
    The default fuel gauge mode is called the anti-slosh mode. To prevent fuel gauge changes from fuel slosh (gauge instability due to changes in fuel sender readings caused by fuel moving around in the tank), the fuel gauge takes approximately 55 minutes to go from empty (E) to full (F).
    The key OFF fueling mode (2 seconds to read empty [E] to full [F]) requires 3 conditions be met:
    The key must be in the OFF position throughout the entire refueling of the vehicle.
    At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
    The instrument cluster must receive a valid key ON fuel sender reading within 1 second of the key being put into the RUN position. The key ON sample readings are considered valid if the fuel sender reading is between 15 ohms ± 2 ohms and 160 ohms ± 4 ohms.
    If these conditions are not met, the fuel gauge stays in the anti-slosh mode, which results in a slow to read full (F) event.
    The key ON fueling mode (approximately 90 seconds to read empty [E] to full [F]) requires 3 conditions be met:
    The transmission is in PARK (P).
    The key is in the RUN position.
    At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
    In key ON fueling mode, a 30-second timer activates after the transmission is put into the PARK (P) position (automatic transmissions). When the 30-second time has elapsed and at least 15% of the vehicle's fuel capacity has been added, the fuel gauge response time is 90 seconds to read from empty (E) to full (F). When the transmission is shifted out of PARK (P), the fuel gauge strategy reverts to the anti-slosh mode. The key on refueling mode prevents slow to read full events from happening if the customer refuels the vehicle with the key in the RUN position.
    Recovery mode is incorporated into the instrument cluster strategy to recover from a missing fuel level input during a refueling event. Missing fuel level inputs result from intermittent opens in the fuel sender or its circuits. Recovery mode (empty [E] to full [F] approximately 20 minutes) is initiated when the following 2 conditions are met:
    The instrument cluster is in the anti-slosh (default) mode.
    The actual fuel level in the tank is greater than what is being displayed by the fuel gauge

    Feb 18, 2009 | 1983 Mercury Grand Marquis

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