Actually I had that problem, its a faulty fuel sensor, and can be replaced under warranty. at first they had me unplug a fuse while the car was running then shut it off and plug it in then start the car. did that for 2 more fillups b4 they finally replace the faulty sensor.
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Re: fuel gauge / range meter
This is an old post so not sure if problem has been resolved ?? but if not ? from your symptoms it sounds like the fuel tank sender unit is faulty and unfortunately not servicable but not too expensive to diy a new unit for a quick confirmation it is sender ? remove the wire from sender unit then scratch /hold to good earth whilst ignition is turned on and fuel guage is read by assistant ? if guage goes to full ? sender is faulty hope this helps?
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Fuel gauges are not meant to be precision instruments. You might want to fill up a 2 gallon can and drive the car until it runs out of fuel to see how low the gauge will go before it's really empty. Use the 2 gallons to get back to a filling station.
I once spent three working days trying to get a 1972 Chrysler to read full when it's full, half when it's half and quarter tank when the tank has a quarter amount of fuel. The customer did not want to accept anything else, but in the end all I did was to get close, not exact.
It is possible that the fuel float in the gas tank is "drowned", that is, the plastic float might have a slow leak and some fuel found its way inside. This will cause the float to submerge slightly and give you a low reading. To check this you will have to remove the float unit from the tank.
In any case, if you feel up the job (not easy) remove the float unit from the tank and manually move it up and down while checking the meter reading. You can bend the wire holding the float to correct misreadings.
Personally, I wouldn't bother, just be aware that when the reading is low, feel safe that you still have enough fuel to get to the next filling station.
Turn the ignition on and off several times before inspecting the gas tank because a blown fuse is the usual cause for fuel gauge malfunctioning. If the gauge remains motionless, check your fuse box and determine the fuse's location using your service manual. Replace the fuse if the link is broken or damaged. Then, inspect the gauge's wire connections for cleanliness and make sure the wires are connected. Turn the ignition switch to the "off" position. Attach one end of a jumper cable to the fuel-gauge terminal behind the gauge itself. Attach the other end to the ignition terminal. Replace the sender unit in the gas tank if the gauge reads full and your car does not have a full tank. Replace the fuel gauge if the needle remains inoperative.
You have a bad roll over valve. The valve is stuck closed and is causing this to happen. Hyundai has an updated part that can be purchased at the dealership that will solve this problem. You will need to lower the fuel tank to gain access to this valve for replacement though.
khooper, in another forum, told me that "Chevron Techron Fuel System Treatment Plus can remove harmful sulfur deposits from the sending unit and a filmer agent that can prevent the deposition of said sulfur"
My 05 Trailblazer LT 2WD. Erratic readings, and when the fuel level was below 1/2 full, the needle would sit on "Empty" with the amber light staying on.
So I went to a dealer, they replaced the fuel level sensor (p/n 19177712 SEN KIT 3.107 $118.62) with labor $270.00 for a total of $398.86 this appears to have fixed it for now.
I also talked to another mechanic who blames ethanol for these deposits !
My dealer told me that if you fill up beyond the first "click" of the gas pump it will mess up the sensor in the gas tank. It might fix it's self eventually, but can be avoided if you anly fill the tank up to that "click".