After you changed the fuel pump and it still won't start what do you do

Fuel, fire, compression and timing are the 4 items any engine needs to start. Keep in mind that if you have a bad crankshaft and/or camshaft position sensor the computer does not know when to inject fuel or fire the spark, so it won't try. It's also possible that your new fuel pump is not getting any power. Might double check all your fuses. The security system also disables the fuel pump if it believes the car is being stolen, so it seems like a bad fuel pump, but if there is a security light flashing while trying to start, that issue would have to be cured first.