I own a 1992 Mercury Grand Marquis Ls with a gas gauge that does not work (it also may be reversed as in when the fuel is full the gas gauge reads empty) could this possibly be the sending unit??? if so do i have to drop the fuel tank?? anyone please help! thanks.
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:
SOURCE: 1992 Mercury Grand Marquis FUEL LEVEL SENDING
the sensor is located inside the gas tank, you can access the sender from the front of the tank, just make sure the tank is less than 1/2 full or gas will gush out when u remove the sender retainner ring on the tank to remove the sender, u will need the car on a lift to do this...
SOURCE: 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
SOURCE: emergency fuel shut off switch for 1992 mercury grand marquis
It is in the trunk I can remember which side on a 92 but it will be behind the side trim panel almost straight down from the trunk hindge.
SOURCE: mercury grand marquis,ls,2001. the ac blower is
Have you checked the fuse under the dash. You can run power directly from the battery as you did to test the blower just make sure you use a high amp rated switch and make sure you install an inline fuse rated no more than ten amps if you use say 14 guage wire. Let me know how it goes good luck.
SOURCE: Cruise Control - 2000 Mercury Grand Marquis LS - not working
Your manual should tell you that. Also check your brake light switch by the brake pedal. It also disengages the cruise. If it is bad the cruise will not work but the brake lights may still work.
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There was a trouble service bullitin issued concerning this problem coverning 90-94 Grand Marquis 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. 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
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