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Originally Posted by tanstaafl14
I've noticed that when the tank is down to 1/4 capacity or less, the fuel gauge will occasionally go down a bar, then back up again. Yesterday it went from 2 bars to 1 (triggering the low-fuel light) for a couple of minutes, then returned to 2 bars (light went out). I was on my way to the gas station anyway, so I wasn't too concerned. 
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I have noticed many times that once the fuel gauge gets to 1 bar the light comes on and then after a few miles depending on whether or not I'm going uphill/downhill, I'll get 2 bars to show and the light goes off.
I think its because what little fuel is left, 1-2 gallons, is sloshing around in the tank and confusing the sensor. Probably need to do this experiment on level ground, if you can find any. Not sure, but I dont think its a good idea to run the tank to almost dry because of the stuff that may be lurking at the bottom of the tank like water/condensate.