Have 1995 blazer won't start after changing fuel filter?

have replaced fuel filter tried to start acted like no was not getting spark. replaced pick-up coil under rotor cap and replaced coil. what else would cause it not to start?|||The engine will still start and run with the filter in backwards,it just won%26#039;t run right.Is this regular maintenance,or was there a problem to begin with? Either way,have someone listen for the fuel pump to run with the key turned to the run position.The system has a relay to prime fuel pressure for two seconds.If the pump is grinding or not running,you%26#039;ll need to check for voltage and ground or replace the pump.Assuming you have the 4.3L engine,you%26#039;ll need at least 55psi. fuel pressure for the engine to start.Thats minimum!|||you may have a clogged fuel line, if not try taking it to a shpo.|||you put the filter in backwards!! there is an arrow on the filter that shows the fuel flow direction!! reverse the filter and it will fly again!!|||it is very likely that you installed the filter backwards double check then check for fuel pressure.