If you find your car surging or stuttering you may have a faulty fuel pressure regulator. Changes in the fuel pressure can affect the power and performance of the engine and can be potentially dangerous.
Don't get caught at the side of the road with an empty tank even though your gauge says full. The fuel tank sender is used to measure the amount of fuel in the fuel tank and send an electrical impulse to the fuel gauge. If your fuel gauge is starting to give incorrect readings, it's possibly this sender.
In modern cars the tolerances in fuel pressure in your system can be very tight. The fuel pump needs to be able to send a certain volume of fuel at a certain pressure constantly. If you are having issues with the performance of your engine you may have a fuel pump going bad.