Chrysler Repair: Gas Gauge, 1994 chrysler concorde, chrysler concorde

Question
I have a 1994 Chrysler Concorde the gas gage does not work properly how can I fix this problem. What happens is that the need gas light will blink and then go out.My gas gage reads full and will not drop the way that it should. After driving a few miles when I stop the car and restart it the gas gage will read empty and my gas light will be on in both places the message center and the dash. How do I fix this?
Thank You
Donald Robinson
PS also have an intermittent working CD radio what causes this

Answer
PS I would begin by checking the resistance that the fuel level sensor is showing when the gauge reads "empty" even though the tank is virtually full. If it is around 900 ohms instead of around 50 ohms then the float/resistor is bad and you need to remove it from the pump module and replace it. So pull the plug on the top of the pump module and measure to see what it reads in ohms between pins 2 and 4. Then let me know. I can xerox and postal mail you 5 pages from the manual that show how to replace the float/resistor unit. Just give me your postal mailing address. After you get the pages you can mail be back a couple of 42 cent stamps to cover my cost.
Roland



Hi Donald,
Lets deal with the fuel gauge first, then later the radio.
It would be wise to check the resistance variation of the fuel float system to begin with. You get to the top of the fuel tank thru an access plate under the floor mat in the trunk. There is a 5-pin electrical plug on the lid. If you measure the resistance between the 2 and 4 pins of the plug it should change according to how much fuel is in the tank. When it is full it should measure 0 to 60 ohms.
At half a tank 470 to 530 ohms, and at empty 900 to 950 ohms.  So based on keeping track of the miles driven and thus how full the tank is calculated to be, see if these ohm readings are what you get, both just before shutting of the engine and later. If the readings of resistance track the malfunction of the gauge, then I would recommend replacing the float/variable resistor in the tank. If not, then checking over the wires from the tank to the body computer to the guage will be necessary. So start by using an ohmmeter to see how the gauge is reading compared to the ohm readings. Once you see which is the cause I can tell you how to correct it.
Roland