My 97 Grand Marquis wont start I changed fuel pump and filter it turns over but wont start and battery dies

Cam shaft positioning sensor

Altanator or ignition coil.

Good Luck

probably the altenator

Check in the trunk for a relay switch probably near well well if one there try resetting relay , if do not work take it to dealer for diagnostics do not keep guessing it is costly

Check for flow / psi on the fuel rail. You will see a little valve, looks just like a tire is valve stem.

if the battery isnt holding a charge then either your battery is bad or the alternator is shot. depending on the car an alternator is usually about $80-100 but its easy to change.

dont keep changing parts trouble shoot proplery and start at the beginning was the fuel pump bad to begin with?say money take it to your mechanic or dealer this new electronic parts it could be anyone of 12 items which could be causing this problem from a bad module to a defective sensor etc etc just look at all the other guesses you have in your good luck

Disconnect the Mass Air Flow sensor, and see if it starts

check the crank trigger for the ignition, it is a little plactic piece just behind the harmonic balancer, sometimes it gets full of grease & dirt & will stop the spark, to see if it is getting spark -pull one spark plug out & as someone turns over the engine check the spark plug to see if it is getting a nice blue spark, if u have no spark & the crank sensor is not broken the coil may be shot, it is on a bracket on the drivers side of the engine, it takes a 5.5mm socket to get the 4 screws out, it has a easy plug in connector, they cost 16.00 at auto zone