Fuel light comes on when I have 5 gallons of fuel
3 Answers
At least you know what is going on. I doubt there is any easy way to adjust the light to turn on when the tank is lower.
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Better to have it come on a little sooner than a little too late! I would leave it alone. Did the level indicator come with any calibration instructions? If so, follow them or call the manufacturer for help.
3 gallons are meant to be "reserve", it's more for long hauls on the interstate or simular I think.