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There is a switch in the airflow meter that engages the fuelpump once the afm opens.
To test this, do two things.
1. Take a piece of wire, and jumper pins +b and Fp on your diagnostic connector. This will cause the fuel pump to run continuously. At this point, if the afm switch was the problem, the car should run.
2. With the ignition on, push on the afm's metering door. You should hear the fuelpump cut on. If it doesn't, then this indicates a problem with the switch.
Also, if you have a major air leak between the afm and the throttlebody, this can cause an overly lean reading to the ecu causing this sort of problem.
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