might be a bad sending unit
The sending unit in the fuel tank is defective,, replace it and fix your problem.
quick and easy answer .... the ''fuel sending unit'' IN the tank has gone bad and it should be replace ...........
my 1995 k1500 suburban weighs in at 6,000 lbs. full of fuel
The gauge and low-fuel light use different senders. The sender for the low-fuel warning is either malfunctioning or there is a wiring fault.
The factory says it not necessary to change fuel filter but i have changed hundreds of these filters and they are always full of trash www.lextechautomotivellc.com
If your 2005 Nissan Frontier has a full tank but the fuel indicator shows empty and the service engine light is on, you may need the computer or the "brain" reset or replaced. You can take the truck to a garage or to the Nissan dealer to have this done.
inertia
You've got to drop the tank and replace the float that's the part that tells the light when its full or empty....if that doesn't work then replace the gauge sending unit...if that isn't it then check if the light is what is bad replace the light...if that doesn't work then i don't know !!!
This is usually cause by a vacuum leak in the fuel tank evaporative system.
I drive from Inverness to Telford 450miles on a full tank with the light just coming on.
hole in fuel sender gauge float
Defective sensor