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It could be your fuel gauge or your sending unit or the wires connecting them . If you have dual tanks it could be the switch that changes tanks. The most likely culprit is the sending unit in the tank.
take the gas tank down and change the fuel sensor that is in the tank.
check the cross over valve and lines they could be cloged maybe part of the fuel selector switch is bad I had this problem
There is no switch(other then fuse) the fuel pump is inside of tank. Try thumping the tank, it has been known to work other option replace fuel pump
it does not switch between cng and gas all the switch does is changes the dash board fuel switch to show how much gas in in your tank when you are running on CNG
headlight switch
Mine has to be pumped up by hand then the I press a switch to activate the spray nozzle.
Most vehicles with two fuel tanks have two fuel pumps. If the fuel gauge shows the reading in the front tank, the switch is most likely good, and the fuel pump is bad.
It could be a bad dimmer switch, or the low beam elements inside the dual headlight bulb could be burned out.
check the fuses, wiring connectors, switch, exc.
Sends power to the selector causing the door inside the unit to open and close swapping tanks.
Check the brake light switch on the brake pedal. Might have to replace it.