Question about 1983 Mercury Grand Marquis

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Fuel gauge not working all the time.

I have a 2006 Mercury Grand Marquis. Today my tank was HALF FULL,, so I filled it up. I put $20.00 worth of gas in it. As usual, I started clearing my message center, to get new readings. I notice it said there was only 185 miles to empty. Then I noticed the gas gauge was still on half full. After starting it up a few times, it gradually got to full. It is still under warranty for a few hundred miles. Do you think this is a problem I should get checked out?

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  • Anonymous Mar 12, 2014

    the fuel gauge quit working properly when I filled the tank the gauge takes a long time to go to full

  • Anonymous Mar 12, 2014

    the gas gauge does not read full immediately after a fill up it take it a long time to reach full

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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

Posted on Feb 18, 2009

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Article No.
95-2-3 01/30/95
^ GAUGE - ERRATIC DISTANCE-TO-EMPTY AND FUEL GAUGE READINGS - VEHICLES BUILT BEFORE 1/1/94 ^ GAUGE - FUEL - ELECTRONIC - "CO" DISPLAYED IN ELECTRONIC CLUSTER WITH TWO TOP/BOTTOM BARS HIGHLIGHTED - VEHICLES BUILT BEFORE 1/1/94 FORD:
1986-92 TAURUS
1989-94 PROBE
1990-94 CROWN VICTORIA
1993-94 THUNDERBIRD LINCOLN-MERCURY:
1985-92 MARK VII
1986-94 CONTINENTAL, SABLE
1990-94 GRAND MARQUIS, TOWN CAR
1993-94 COUGAR, MARK VIII LIGHT TRUCK:
1990-94 AEROSTAR ISSUE:
There may be erratic Distance-To-Empty (DTE) and fuel gauge readings, or circuit open "CO" displayed in the electronic cluster with two (2) top/bottom bars highlighted. This is caused by fuel sender card overprint material and/or an intermittent connection between the spring and contact on the sender card.
fuel gauge not working all the time. - 41799320 ACTION:
Install a revised sender assembly or fuel pump/sender assembly. Refer to the appropriate vehicle Service Manual, Fuel System Section, for removal and installation procedures. Refer to the Parts Block in this article for correct parts usage. OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS:
Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage For 1992-94 Models And 1991 Lincolns, Major Component Warranty Coverage For 1990 And Earlier Model Lincolns, Basic Warranty Coverage For All Other Models OPERATION DESCRIPTION TIME 950203A Replace Fuel Gauge 1.5 Hrs. Sending Unit - Town Car 950203B Replace Fuel Gauge 0.9 Hr. Sending Unit - Crown Victoria/Grand Marquis 950203C Replace Fuel Gauge 1.0 Hr. Sending Unit - Taurus/Sable 950203D Replace Fuel Gauge 1.2 Hrs. Sending Unit - Mark VIII 950203E Replace Fuel Gauge 1.1 Hrs. Sending Unit - Probe 950203F Replace Fuel Gauge 1.2 Hrs. Sending Unit - Thunderbird 950203G Replace Fuel Gauge 0.9 Hr. Sending Unit Mark VII 950203H Replace Fuel Gauge 1.2 Hrs. Sending Unit Aerostar DEALER CODING BASIC PART NO. CONDITION CODE 9275/9H307 G25 OASIS CODES: 204000, 204100, 206000

Posted on Mar 23, 2013

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Fuel gauges are not meant to be precision instruments. You might want to fill up a 2 gallon can and drive the car until it runs out of fuel to see how low the gauge will go before it's really empty. Use the 2 gallons to get back to a filling station.
I once spent three working days trying to get a 1972 Chrysler to read full when it's full, half when it's half and quarter tank when the tank has a quarter amount of fuel. The customer did not want to accept anything else, but in the end all I did was to get close, not exact.
It is possible that the fuel float in the gas tank is "drowned", that is, the plastic float might have a slow leak and some fuel found its way inside. This will cause the float to submerge slightly and give you a low reading. To check this you will have to remove the float unit from the tank.
In any case, if you feel up the job (not easy) remove the float unit from the tank and manually move it up and down while checking the meter reading. You can bend the wire holding the float to correct misreadings.
Personally, I wouldn't bother, just be aware that when the reading is low, feel safe that you still have enough fuel to get to the next filling station.

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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:
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    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.
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    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.

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