The fuel tank sending unit allows you to see what your car's fuel levels are. In most modern cars, the fuel tank sending unit connects to the fuel pump. It uses a float and sensor to determine your car’s fuel level (and which the fuel gauge is designed to reflect). Unfortunately, a faulty fuel sending unit may cause the fuel gauge to stick in one place, or flicker randomly on the dial. When the sending unit malfunctions, the Check Engine signal on your dashboard will also usually light up. To avoid running out of fuel and/or damaging your engine, it is vital to ensure that your fuel tank sending unit is working properly. Find the perfect fuel sending unit for your car here at Euro Car Parts.