Using a starting fluid is a very quick way of narrowing down a ‘cranks but does not start’ condition (although it's not the most accurate way of diagnosting a bad fuel pump). TEST 1: Using Starting Fluid To Confirm Lack Of Fuel Alright, with this info under our belts, let's get testing. Back-fires thru' the intake manifold when accelerating your pickup or van 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 fails slowly, your Ford 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 4.2L equipped pickup or van isn't gonna' start. Symptoms Of A Bad Fuel Pumpįuel pump failures fall into two categories: Total fuel pump failure and a slowly dying fuel pump. You can find this tutorial in Spanish here: Cómo Probar La Bomba De Gasolina (4.2L Ford E150, E250, F150) (at: ). Where To Buy A Fuel Pressure Test Gauge.TEST 2: Checking Fuel Pressure With A Fuel Pressure Gauge.TEST 1: Using Starting Fluid To Confirm Lack Of Fuel.
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