Fuel Tank Sending Unit - Left

The sending unit is located in the fuel tank of your vehicle and it consists of many various items, including a float and a thin metal rod. This mechanism is one reason for the inaccuracy of fuel gauges. You may have noticed how your gauge tends to stay on full for quite a while after filling up, yet once you get below half way, it seems to drop like a brick.

Obviously, this situation is obvious, but if you are noticing a bit more inaccuracy than usual in your fuel gauge, you might want to consider replacing the unit with the new part from ECS Tuning.