I own a 2005 GMC Envoy with 70k. Today when i gased up the truck, the fuel guage stays stuck at empty along with the yellow light and bell!!! first time this ever happens to me? What can this be?

Hi,
there is a float that floats on top of the gas inside the gas tank. this is connected to the sensor which goes to the fuel gauge. this float may have come off or got saturated with fuel so the sensor arm is stuck at the bottom of the tank. you can take the car up to autozone for a OBD reading but it will most likely have to have to have a new assembly. its inside the gas tank. the gas tank has to come out and it takes a weekend to do this. if you have a handyman in the family tell him you need a new sending unit in your gas tank. it may be integrated with the fuel pump as a whole assembly. you can go to autozone.com for the instructions. I will send along a link. the procedure isnt too bad usually if you take your time. run it all the way down on gas and keep a spare gas can if you run out. get it home on empty and drop the tank. good luck and be careful.
http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?pageId=0996b43f8036f573
jm

The fuel level arm/float could be stuck, broke, or unplugged. if it is stuck then it is possible that you could shake it loose (slim chance though).