Gas guage reads full all the time

The fuel meter inside the tank has malfunctioned. One option is to replace the fuel pump. Second option is to bring down the fuel tank and remove the fuel pump and check see if the metering rod was bent. Now if you are not having problems with the fuel pump. I would deal with the gauge being low and continue running the car until the time comes to replace the fuel pump.

If he told you the fuel pump would correct the fuel guage, take the car back and make them fix it under warranty. I have been in the auto repair business for 21 years and if I mis-diagnose a car, I have to fix it for free to keep the customer happy.

If the guage is reading but not accurately it may be the incorrect fuel pump for the vehicle or the float is may not be in the retaining clip all the way. Also possible that the float got bent during installation. Can you describe what the guage is doing such as reading full when its 1/2 full or jumping around on you?

You more than likely have a bad fuel level sensor.You should be able to replace just the level sensor without replacing the complete fuel pump module.Hope this helps.Good luck.

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.

2 things.
There is a sensor that goes from the dash to the fuel pump. If it is disconnected, dirty, or faulty, then thats an easy fix.
There is also a float in the gas tank itself. From what Ive been told after time, or going over big speed bumps, etc, that the float just simply doesnt float or register.
Mine actually shows I have a full tank or im empty at all times. No in between.

You will need to replace the Guage. If it is Inside a Cluster, You will need to Replace the Entire Guage Cluster for this Repair. Please Rate My Response! Thanks!

the fuel pump gage is sticking needs replacement/ its pretty easy if you need to do it yourself/ Please rate my response thankk you very much

yes. the fuel sending unit in the gas tank does need to be replaced

Pontiac has a problem with the sender for the fuel guage. A quart of transmission fluid in a full tank of gas usually fixes it. The "engine" light, won't be on because of that. Quite often that is the air filter or fuel cap.