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How to Test a Fuel Pump Like a Boss

 How to Test a Fuel Pump

Your fuel pump is an essential part of your fuel delivery system. It is responsible for getting the fuel from your gas tank, to where it is combusted, propelling your car forward. When your fuel pump is going bad or has stopped functioning, your car’s engine is no longer supplied with the fuel it needs. There are a few things you can do to make sure your fuel pump assembly is still working before you plan on replacing it. By learning how to test a fuel pump, you’ll be able to know the signs and symptoms of a faulty fuel pump.




Turn your key to the accessory mode and listen for a click or a faint clunk. If this does not happen, odds are that your fuel pump has stopped working. But before you stop there, a few more steps should be completed.


Check the relay


One of the reasons a fuel pump stops working is because the relay has gone bad. Knowing how to test a fuel pump and the relay will help determine which one the culprit is. To check if you have a bad relay you’ll first want to locate it. The fuel pump relay is usually in the engine bay so you’ll have to get under the hood. Once you’ve found it, pull it out and give it a good shake. Do you hear anything moving around in there? If you do, the relay is no longer working and you’ll need to replace it. If the relay is fine you’ll have to move onto the next step.


Check the fuel pressure


Checking the fuel pressure is one of the best ways to test a fuel pump and to ensure if it is working or not. If you have a fuel pressure gauge, which can be found at any auto parts store, connect it to the fitting in the engine bay and crank the engine over. If the needle does not move, you know that there is no fuel being delivered to the engine.


Check for power


If your fuel pump is not getting the electrical power it needs to drive the pump, your car will not be going anywhere, anytime soon. To find where to test the source of voltage for your fuel pump, you’ll need to refer to the service manual. Using a voltage meter, you’ll be able to determine if your fuel pump is receiving the power it needs to push the fuel to the engine.


Change your fuel pump


Once you have completed all of these steps you’ll have learned how to test your fuel pump like a boss. You can order your new fuel pump knowing that it’s the fuel pump and not another aspect of the fuel delivery system. Your fuel pump like many other parts in your car, is essential to its operation. Knowing how to test a fuel pump is one of the best things to learn when it comes to fuel delivery.



Written By Dara Greaney


Categories: HowTo