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Bad gauge Bad float in tank
it might be a fuse
no power at the sending unit.
It has a " check gage " light if the fuel gauge is at or near empty , the engine coolant temperature is high , or the engine oil pressure is low
Float could be stuck in the tank or the ground wire on the tank is broke.
Either the sensor is broken or Your gaug on the dash is not working.
there is a sensor inside the gas tank. if you have the GM dealer replace it.. its about $500.00.
Inside. You should always place your rain gauge outdoor in a nice open space where there is nothing to hinder the rain falling directly into the gauge. Mount the gauge vertically and level, and check and empty it after every rain fall.
The way to test the gauge is to unhook the wires to the sender and the gauge should read empty. Now, ground the sensor wire and the gauge should go all the way past the full level. If this happens your wiring and gauge are fine.
the float could stick
That depends entirely on the vehicle and on how accurate the gauge is.
Valve clearance of Volvo f12, are set using a feeler gauge on the lash adjuster.