This is just to make sure that the fuel pump relay and fuse are OK and doing their job. Now, I usually take one more precaution, before condemning the fuel pump as bad and this is to check that the fuel pump is getting 12 Volts as the engine is cranking. This confirms that the cause of your 4.0L engine's no-start problem is caused by a lack of fuel. Let's take a look at what your results mean:ĬASE 1: If the fuel pressure gauge registered 0 PSI. Your fuel pressure gauge should register: 30 to 45 PSI with the Key On Engine Off (KOEO) if the fuel pump is OK. The following fuel pressure test gauge kits are pretty good deals and include the adapter to tests all Jeep with a Jeep-type Schrader valve: You can buy a fuel pressure test gauge just about anywhere and is one of the most important tools any serious DIY'er should have in his/her tool box. Alright, with this info under our belts, let's get testing. Back-fires thru' the intake manifold when accelerating your Jeep down the road.īoth of these conditions can be tested with a fuel pressure gauge.Lack of power when accelerating the vehicle down the road.You'll probably see one or more of the following symptoms: 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: ). TEST 2: Using Starting Fluid To Confirm Lack Of Fuel.TEST 1: Checking Fuel Pressure With A Fuel Pressure Gauge.Where To Buy A Fuel Pressure Test Gauge.
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