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i did read the test where you disconnect the "brown" wire near the tank neck and the guage should jump to full.looks good.then i think you're supposed to ground out the disconnected wire and the guage should jump to empty.nothing happened.while properly connected the guage will only go from full to about a quarter empty no matter how much fuel is used up.is this a problem with the tank sender or the guage?what else can be done?this is a stock 68 ss 396 with stock guages(no idiot lights).can you replace the stock piece that provides the resistance at the guage?itooks like you could.thanks for any help,i never really know how much fuel is in the tank.
 

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used to have that problem with my 68...believe it was the float getting saturated. replaced the sending unit, prob solved
 

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I would check the ground at the gauge. With key ON, clip a temp ground directly to the gauge and see if it goes to empty. Could be that the ground wire on the instrument panel is not making good contact.
 
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