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My car stopped in the middle of driving it ....when I tried to start it again it would only stay started for a second .... I brought it to a mechanic and was told that it is my fuel pump that needs to be changed ...... he said it also could be the fuel injection that needs to be changed , he said that he can’t tell exactly ...... is there any way to tell exactly which one is bad ?

Answers from the Automotive Experts

Jessica Howe, Automotive Expert & Coach at


Thank you for writing in with a great question. Yes, there is a definitive way to tell if the pump or the fuel injectors are to blame. You must test the fuel pressure at a point between the pump and the fuel injectors. To test the fuel pump's pressure, you have to install a fuel pressure gauge between the pump and the fuel rail on the engine. You can then crank over the engine and read the fuel pressure provided by the pump. If the fuel pressure is adequate, you can focus on another potential issue like the fuel injectors. If the pump is not providing enough pressure, you know that it is likely to blame. You must also consider the fuel filter, as they can clog with debris if not changed regularly. If you test the fuel pressure at a point in the fuel line after the fuel filter, you may also be loosing pressure at a clogged fuel filter. Good luck! 

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