The PCM will still pulse (activate) all 6 fuel injectors.īut when the fuel pump sends a lower than normal volume of fuel, your Jeep will start and run but with engine performance problems.The ignition coil pack is creating and distributing spark to all 6 cylinders. The engine turns over but will not start.In this type of scenario you'll see that: Obviously, when the fuel pump completely fails, your 4.0L Jeep isn't gonna' start. It'll either stop pumping fuel or it will pump a volume that's lower than normal. The fuel pump, in your 4.0L equipped Jeep, usually fails in one of two ways. You can find this tutorial in Spanish here: Cómo Probar La Bomba de Combustible (4.0L Jeep) (at: ).
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