Question about 1993 Ford Thunderbird

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Gas gauge on 1993 thunderbird not working correctly. it will read at ay 1/2 tank and 5 mile later it will read 1/4 tank

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You need too replace the sending unit in the tank!!!!!!!

Posted on Apr 20, 2009

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Why does my 2002 SC430 gas gauge needle not work when tank is full?


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My fuel guage won't work, any suggestions?On a 93 thunderbird


Dear Dead Gauge.........I'm so sorry to hear about your loss.....fortuneately this is a very common tsb that fails on these vehicles. The gauge itself rarely ever fails....but the sending unit in the tank always does.... Thats right.... I said in the tank....Easiest way to go about this is to simply siphon the tank to empty....then lower the tank to the ground with the aide of a floor jack.....or bring it to your local trusty mechanic......either way....after the repair is done you can be assured that your gauge will be working accurately for quite some time.......if ya need anything else please get back to me...HOPE I COULD HELP!!!

Nov 16, 2009 | 1993 Ford Thunderbird

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2005 kia sorento Fuel Gauge says empty with 1/2 tank of gas.


Fuel sensor is not working well. Just changed mine today for the same problem.

Oct 26, 2009 | 2007 Kia Sorento 4x4

2 Answers

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

2 Answers

Gas Gauge not reading correctly


The most likely culprit is the sending unit in the tank. They are relatively easy to change, as long as you don't have much fuel in the tank. It's a mechanical unit that has a float that raises and lowers with the fuel level, however with age, the floats can develop leaks and no longer float, of the electronic portion of the unit can go bad and not register the proper level. They are replaced and an entire unit, so it doesn't matter which happened, you will need to change the fuel tank sending unit.

Jan 11, 2009 | 2004 Ford Explorer

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