Very Very Very common in Buicks of many years and Models. Aside from pulling down the fuel tank and replacing the sending unit. We just go by the mileage and go from there. Its a major issue with no recall on it.
SOURCE: Fuel gauge issues
Sounds like you've got a defective fuel level sending unit. It's in your tank, probably attached to the boost pump assembly. Normally the top of the tank can be accessed via the trunk where you should be able to remove the assembly for replacement. While you're in there, look around in the tank with a very bright flashlight for any debris or pieces from the assembly laying on the bottom.
Horrible gas mileage can be caused by very many things. Try to buy an OBDII diagnostic scanner to figure out what's malfunctioning. Sensors don't last very long, and can wreak havoc on performance and economy.
SOURCE: 2001 Buick Lesabre - Fuel Gauge not showing correct reading.
sounds like you probably need a fuel level sender. it's located in the trunk on the right hand side attached to the fuel pump. I got one on ebay for about 20.00, but you might as well replace the fuel pump while you're at it, as it can go bad with time.
SOURCE: Fuel gauge not give proper reading.. register full
Sorry to say,but the fuel sending unit is the problem,the fuel tank will have to be lowered out of the vehicle to replace the unit.If the fuel sending unit is not available by itself you will have to replace the whole fuel pump assembley.
SOURCE: 2000 Buick Century gas gauge reads full all the time
You're either looking at a short in the wire that goes to the fuel sender, or a bad fuel sender. If it was just a broken wire, it would read empty instead. The fuel sender is a permanent part of the fuel pump, so that has to be replaced as a unit.
SOURCE: Fuel gauge reads full after fill up, but
I had that problem when was the last time you replaced your battery?How old is it?
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