First of all, you have to check for spark. If it is missing, the problem is not fuel related. If you do have spark but not fuel, you must first understand there will not be any voltage to the fuel pump when the ignition switch is turned on and you go back to test it. You must have a helper to turn on the ignition switch, or you must prop the test light or voltmeter where you can see it from inside the car.
There will only be voltage to the fuel pump, coil, injector, alternator field, and O2 sensor heaters for one to two seconds when the igntion switch is turned on, then it will go away. That will be proof the circuitry is good. If you hear the pump run for that one second, it is working too The voltage will appear again when the engine is rotating, (cranking or running). If it doesn't, suspect the Hall Effect pickup assembly under the rotor in the distributor.
The voltage for all these things comes from the Automatic Shutdown (ASD) relay. The Engine Computer turns that relay on when it gets pulses from the sensor in the distributor.
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Sunday, March 7th, 2010 AT 7:39 PM
