![]() How To Test The Fuel Pump On GM TBI Fuel Systems (for throttle body fuel injection fuel system equipped vehicles).Troubleshooting the fuel pump (GM 4.3L, 5.0L, 5.7L) (for ‘Spider’ fuel system equipped vehicles).Depending on whether your vehicle has throttle body fuel injection or the ‘Spider’ fuel injection system, the following tutorial will help with this test: Testing the fuel pump is something you can do. If the pressure gauge DOES NOT register the correct fuel pressure, this usually means:.The fuel pump is getting power and Ground.If the pressure gauge does register the correct fuel pressure, this confirms:.When testing the fuel pump with a fuel pressure test gauge, you'll get one of two results: correct fuel pump pressure, or low/no fuel pump pressure.Keeping the two modes of failure in mind, the most accurate way of testing the fuel pump is with a fuel pressure test gauge. The fuel pump usually fails in one of two ways (in the pickups and SUVs covered in this article), it either fails completely and doesn't send any fuel to the engine or it still runs, but doesn't send enough fuel to start or keep the engine running. Lack of fuel reaching the injectors is the other major and common cause of a no-start condition and that's usually caused by a bad fuel pump. How To Test The Camshaft Position Sensor Diagnostic Trouble Codes: P0340, P0341.How To Test The Crank Sensor (GM 4.3L, 5.0L, 5.7L).How To Test A Misfire / No Spark No Start Condition (at: ).Testing the distributor cap, the ignition coil to distributor cap high tension wire, the ignition coil, the ICM, and the crank sensor can by done by the do it yourself-er (DIY'er) and the following tutorials will help you test the ignition system: The crankshaft position sensor could be bad.The ignition control module could be bad.The ignition coil to distributor cap high tension wire could be bad.If there's no spark present in all 8 cylinders:.The crankshaft position sensor is good.If spark exists in all 8 cylinders, this then confirms that:.Check that the 8 cylinders are getting spark with a spark tester.The idea behind checking for spark (with a spark tester) is to see if all of the 8 engine cylinders are getting spark. As mentioned before, usually one of them will be missing from the mix. Both of these tests should be done simultaneously if possible. The very first thing you need to do is check for spark and the presence of fuel. ![]()
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