Gas hitachi My one gauge by my hose hookup dosent move, my tanks are empty but the gauge is still the same(120). Any ideas??

Buick gas tanks are shaped so when full they take a while before the gauge comes off full. After 1/2 then the gauge will move towards empty quicker. When on an incline it will show more gas than is actually in the tank, so when you're cornering, it's reading will be indicating the moving level. I wouldn't worry about it

There is a sender unit failure. Likely it would need to be replaced.

Doubt it.
The same fuse for the gauge would handle the rest of the cluster.
Probably the sending unit in the tank.

faulty feul sending unit or bad ground will need to use a meter to test the system

The rubber hose that runs from the gas cap down to the tank has a smaller hose inside it. The gas goes down inside the smaller hose and the air comes up around the small hose and vents at the gas cap. It sounds like one or both hoses have become crimped somewhere. I wonder if maybe you have hit something like a parking lot curb or had a really hard thump near the gas cap. Crawl under your car and look for the gas tank filler hose. I think you will find the hose bent or collapsed between the cap and the tank. Replacing the filler hose is not difficult but can be frustrating. You may have to lower the tank to get enough clearance to remove the old hose and install the new one. The other suggestion is to see if your gas gauge is working properly. Is it possible that the tank is full and the gauge shows empty? Let me know what you find out.

It sounds like the fuel sender is bad in the fuel tank.

chevy and gmc trucks have an on going problem with this,turn the key on,and get a rubber mallot or a hammer and hit the bottom of the fuel tank a couple of times,this will unstick something in the fuel pump/sending unit.

the problem is caused by a defective gas gauge sending unit, this part is located inside the gas tank, you must remove the gas tank to replace it.

the buffer plates in the tank seem to be loosely held! so sometimes they fall on the sender unit,causing the gauge to drop!!!!! when the vehicle is shaken!!!! remove that tank and have the plates checked!!!!

Usually if the gas gage does not work yes it is true it may be the sensor if it is electronicly controlled. the sncor will more than likley be in the tank. here is how to remove your gas tank.

1. Before servicing the vehicle, refer to the precautions section.
   
2. Relieve fuel system pressure.
   
3. Drain the fuel tank.
   
4. Remove or disconnect the following:
   
   • Negative battery cable
     
   • Fuel filler and vent hoses
     
   • Fuel tank skid plate
     
   • Fuel tank wiring connectors
     
   • Fuel supply and return lines
     
   • Fuel tank
     
   • Fuel pump assembly
     Fuel pump assembly mounting
     

To install:

1. Install or connect the following:
   
   • Fuel pump assembly
     
   • Fuel tank. Tighten the bolts to 27 ft. lbs. (36 Nm).
     
   • Fuel supply and return lines
     
   • Fuel tank wiring connectors
     
   • Fuel tank skid plate
     
   • Fuel filler and vent hoses
     
   • Negative battery cable
     
2. Start the engine and check for leaks.