Fuel pump relays have just a few internal parts that can affect the proper operation of an electric circuit. A small coil and two contact points are the most common components to break or burn, cutting electric flow to the fuel pump. These steps will help you troubleshoot the fuel pump relay on your car as well as help you know whether you need to replace it. Let's us see how to check a fuel pump.

  Identify the two control circuit terminals and the two power circuit terminals. Most relays have a diagram printed on the case itself to identify these terminals. If not, look at the mounting base of the relay. The two thin-gauge wires that connect to the relay feed the control circuit terminals; the other two thick-gauge wires connect to the power terminals. Leave the jumper wires connected to the relay control terminals and test the power terminals for continuity as you did in step 4. This time you should read zero or a resistance value in the hundredths or thousandths. If you read infinite resistance, replace the relay.