I have a 2002 grand am se with a 2.2 eco tech and I replaced the fuel pump and now it backfires and won't stay running what's the problem

Check the crank case sensor

did you give it a tune up change plugs fuel filter

You better find yourself a more knowledgeable auto tech .

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Sounds like a fuel supply problem. The fact that it does momentarily start, indicates its not an electrical issue. However, no steady fuel supply to the injectors and it won't run for more than a second or tow. Your problem is in the fuel delivery system most likely. Either the pump, or (if the unit is located in the fuel tank) the fuel filter may have ruptured. That would sent all the fuel back to the fuel tank not to the injectors.

Most Fords have a fuel reset button. When you ran out of gas you tripped the circuit. Most of the time the button will be on the passenger side by the kick panel. The exact location should be in your owners manual or your local library or auto parts store will have a copy of one for your specific vehicle.

Backfire is a result of too much air,not enough gas.You need to look at the air system,possibly the O2 sensors,air filter,or some sort of fuel:air mixture control.

You might have gotten a defective fuel pump. Was the fuel filter replaced? The sock on the end of the pump should have been replaced also.

ck spark plugs,,take all out ck gap,& condition of them,,may have timing issue,,,

Check the charging system13.65 volts,to 14.25 volts at the battery when running and lights and blower fan on high.Check the battery connections,that they are clean.The fuel pressure maybe low,check the fuel filter,and the fuel pressure to see if the fuel pump is weak.

Any repair shop can look up the time in the labor manuels for you. If you have a couple days and enough tools do it your self. The main issue is how did you test for a bad pump and is that your problem??