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Old 09-06-2005, 06:05 PM
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Gas guage question

Got new guages (yr old) and my gas guage was working fine but now all of a sudden it always shows full when I start up the car. When I turn the car off it goes down to empty. Seems it started when I filled up right to the brim. Any suggestions, Ground is O.K. Thanks Dana
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Old 09-06-2005, 06:11 PM
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Just guessing, but it sounds like the float on the sender is jammed at the top of the tank.
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Old 09-06-2005, 06:27 PM
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Quote:
Originally Posted by poncho62
Just guessing, but it sounds like the float on the sender is jammed at the top of the tank.
I am saying thats a darn good guess Either stuck or broke. If it happened then, I would be pulling the sender.
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Old 09-08-2005, 03:33 AM
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Wire

Doc here ,


Check the wire from the sender..It may be broken or cut..or just fell off...


pull the wire from the gauge, it should read Full or Empty (depending on how wired..)

Then Ground the wire..The gauge should drive full deflection the opposite way..If not look at that sender wire..

Doc
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Old 09-08-2005, 07:30 AM
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Hey Docvette, got a question fer ya. My son has an 03 ZO6 Vette. He has been noticing his gas gage reading strangely, depending on which brand of gas he uses, Exxon/Mobil, or Chevron his gage will not read all the way full when he fills up. If he fills up with Exxon his gage only read about 7/8 full. Fill up with Chevron and the gage reads full. On the ZO6 forum there has been discussions on this phenomenon. Seems the newer Vettes have some sort of capacitive fuel level sensing mechanism that depending on the particular ingredients of the fuel you are using the level indication may or may not be accurate. Ever heard of this?

Vince
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Old 09-08-2005, 06:17 PM
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senders

Doc here,

Yeah, although I have never worked on one..I have heard the stories..

They use as I understand it , a Liquid level detector, inside the fuel cell, that feeds to an op amp configured into a transimpeadance or transconductance amp ( a non current generator) then fed to the DIC computer compared to standard weight, and the resultant displayed on the DIC display.

The Liquid level detector is a piezo (Sp?) Crystal that measures the weight or volume of the fuel .

I honestly think the differences occur at the refinery Although I don't know this for sure, but some refineries use more sulfur to Crack the crude..than others and this may account for the differences..OR possibly refinery added additives could account for this too..

Doc
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