If the inertia switch has not been tripped, then I would recommend testing/checking that the fuel pump is receiving power anyway (to indirectly test the fuel pump relay): This usually means that the pump has failed, but not always.īefore condemning the fuel pump as bad, you need to make sure that the fuel pump inertia switch has not tripped and therefore blocking power from reaching the fuel pump. The cool thing about using a fuel pressure gauge to test the fuel pump, is that once you've confirmed that the fuel pressure is at specification, there's no need to spend time testing them or money replacing them.ĬASE 2: Fuel pressure IS NOT present. Not only does this result tell you that the fuel pump is OK but that the following components, that supply the fuel pump with power, are OK too: The fuel pump test should be conducted with a fuel pressure gauge, so that you can get an accurate result you can trust (any other method may have you wasting time and money on a fuel pump your vehicle does not need).ĬASE 1: Fuel pressure is at specification. The usual suspect behind this is the fuel pump. If the fuel does not reach the fuel injectors or if the injectors do not spray the fuel into the engine cylinders, for whatever reason, you'll get a no-fuel no-start condition.
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