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I replaced the fuel pump and the fuel pump relay also the battery is new and its cranks but it is not starting. What do I need to do next? or replace? possibly since its a 2002 Alero, would it be the ignition switch?
You need to test to see if the relay logic is turning the relay on. If the relay is supposed to be engaged and isn't - then replace the relay. If it is engaged, then trace the power from the relay to the fuel pump to find the open circuit.
note: I had an issue with one of these where the power to the fuel pump was good, but the ground was open on the return side.
could be a lot of things fuel pump or maf or map sensor chech the device that hesures the air folw if it is unhooded rehook it and see what happens. If you need more help post here for more informtion.
I had a very similar problem - someone also replaced the fuel pump to no avail. I found the problem to be a poor ground connection where the fuel pump wires were joined to the connector under the rear of the car. I was able to easily fix this by listening for the pump while moving the cable connector. Haven't had a problem since.
fuel shutoff switch is actually a fuel pump relay in the relay box under the hood, but it is not unusual for a fuel pump to work on and off before it finally dies. but it is a good idea to check the relay first.
try swapping it with the horn relay (if the horn works). pay attention to the direction the relay is in. on GM's, it's possible to put them in backward or even miss the connectors completely.
you also want to check for proper power and ground in the relay socket.